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Nen (念, Mind Force) is one of the defining features of the manga Hunter × Hunter by Yoshihiro Togashi. It is a technique that allows a living being to use and manipulate their own life energy (known as aura).[1] The term "Nen" can also be used in conversation to refer to aura. A person capable of utilizing Nen is colloquially referred to as a "Nen user", while those who cannot go by the name of "non-users".[2] Because one can craft a great variety of para-psychological abilities through Nen, it is considered a dangerous power that is kept hidden from the public at large[3] to maintain balance in society.[4]

Nen and Aura

Aura Nodes and Awakening

AuraExplained

Nen teaches one to control their own aura flow and utilize the energy

Aura (オーラ, Ōra) is the life energy produced by all living bodies vital for survival. Aura from all parts of the body has a tendency to flow together, producing one mass of energy. This happens without the individual's awareness, typically resulting in a slow leak of aura continually escaping the body[1] and stemming up and off the top of the head.[5] The pores or points on the body from which aura flows out from are called "Aura Nodes" (精孔) (しょうこう, Shōkō). In normal conditions, aura leaks away constantly without exceedingly harmful consequences; however, if someone whose Aura Nodes are fully open does not attempt to close them or control the flow of their aura, they will soon grow so fatigued they will be unable to stand[6] or even lose consciousness.[7] Grave wounds such as mutilations can disrupt the flow of aura in the affected body part and even stop it altogether.[8] Controlling one's Aura Nodes is the first step to becoming a Nen user.

Only someone whose Aura Nodes located in the eyes are opened can see aura,[6] whose normal leakage looks similar to water vapor from a kettle. Nonetheless, sensitive individuals can feel its presence without being aware of its existence. It has been described as feeling like a warm, viscous fluid at rest,[6] whereas powerful, refined auras produce a sensation that feels akin to needles pricking into the skin.[9] Hostile aura generates extremely unpleasant sensations, which can cause a non-user to halt in their tracks and be unable to walk towards the source as if a wall had been erected in front of them.[6] Since every living being emits aura subconsciously, learning to sense aura is a useful skill for those tracking living things or hunting non-living things infused with aura. An experienced user of Nen can judge the location and relative strength of their opponents through reading the output of their aura.[10] On the other hand, skilled Nen users can also regulate the flow of their aura so they appear to be beginners or regular individuals.[5]

Learning Nen and Initiation

Wing initiating Gon and Killua to Nen

Wing initiating Gon and Killua to Nen

A student learning Nen trains to manually open and close their Aura Nodes so that they can control the flow of their aura. One typically learns this process slowly and gradually through meditation. There exists a second method, colloquially called Initiation or Baptism, which consists in forcing the Aura Nodes open via an influx of aura.[6] Despite being much quicker, this method is typically frowned upon by Nen instructors due to the danger it poses to the student if the user is inexperienced or has malicious intent,[6] and it is not considered a standard teaching method.[11] It is referred to as an "attack" to convey the taboo on it, which is due to the fact that non-users who awaken this way without having received an appropriate amount of training might take damage from the process or suffer from exhaustion for a long time due to being unable to control the aura leakage in all[12] but the rarest cases.[6]

Initiation via physically attacking another is common practice at the Heaven's Arena when a non-user reaches the 200th floor and typically results in injury, permanent disability, or even death.[6] Nonetheless, this is by no means the only way to force or, more appropriately, semi-force, the Aura Nodes open: the same result can be achieved through "indirect attacks", non-violent or even beneficial uses of aura on a non-user, such as through healing, lending, or absolutely first class Manipulation abilities.[12] Experienced Nen users can open a student's Aura Nodes simply by performing Hatsu on them.[6]

A state of half-awakening exists in which an individual may be able to control their aura to a certain degree and release a larger amount than a normal person, but still have some of their Aura Nodes closed, which may result in their being unable to see aura. This state can be found in some victims of Manipulation Nen as well as in the bodyguards of Halkenburg Hui Guo Rou, who reached it through the latter's Guardian Spirit Beast.[5]

Nen Potential

Like any skill or ability, one's acquisition and usage of Nen depends on their affinity for it. While all living things posses Nen and are technically able to acquire it, some excel at its usage more than others. What exactly factors into potential and how that potential is expressed is for the most part a mystery. A few things can be confirmed when it comes to Nen acquisition and usage. Most simply would be the user's physical attributes. Those who are more physically gifted than others tend to have more aura on average. Physical attributes may also factor into the type of Nen someone is proficient in with those having high natural strength and endurance being more likely to have an affinity for reinforcement Nen. Genetics and family history also seem to play a part as both Gon and Killua were stated to have a potential you see only in 1 out of 10,000,000 with both of their fathers being extraordinarily powerful Nen users. While physical attributes and genetics are important, the biggest factor for Nen potential appears to be mental strength and aptitude. Since Nen is heavily influenced by the feelings, personality, and thoughts of the user, those with higher mental faculties tend to develop their Hen much quicker with their abilities being more powerful than most. Kurapika was able to develop Nen and Hatsu capable of fighting and defeating individual members of the phantom troupe while the 4th Prince of Kakin developed Nen and his own Hatsu in days.

Nen of the Flame

Nen of the Flame (燃, Nen) is sometimes used in Shingen-ryu kung fu as a precursor to learning the actual Nen. They are mental exercises akin to meditation that strengthen one's force of will. Regular practice can smooth the flow of one's aura. The Four Exercises of Nen of the Flame are as follows:

  • Ten (点, Point): Focus the mind, reflect upon the self and determine the goal.
  • Zetsu (舌, Tongue): Put it into words.
  • Ren (錬, Temper): Intensify your will.
  • Hatsu (発, Release): Put it to action.[13]

Upon his introduction, Wing taught Killua and Gon the Nen of the Flame as a fake sense of Nen that focuses mostly on meditation and on one's self.[13] Not all steps of this method directly manipulate aura and most have no visible effect; however, after Gon was injured by Gido and forbidden to use Nen for two months to recover by Wing, both Gon and Killua practiced this method,[14] and in fact made it more natural for them to use regular Nen. Given that Nen is linked to emotions and mental state, this method can be particularly useful to train Nen without aura, although normal use of technique is usually preferred.[15]

Properties of Nen

Nen and Emotion

Hisoka episode 16

Togashi typically indicates this effect through his shading

Although the production of aura is unconscious and constant by all living beings, it is not only life energy. Aura carries with it the desires and emotions of the one who deploys it, which is what allows for Nen to have an incredible versatility to those who develop their skill at using it,[15] and also heavily influenced by mental condition and emotional state.[16] A basic application of this phenomenon is that one can channel their aggression or malice into their aura and deploy it towards another person (i.e. bloodlust). The antagonized will then be able to feel that bloodlust as if it were physically palpable; if unable to keep it from their own body by deploying their own Nen, he/she may be psychologically as well as physically harmed by it.[6] In certain instances, emotional factors may even lead to one exceeding their current ceiling. This could potentially prove advantageous, but in general using one's powers beyond their capacity entails a great risk and will ultimately cause strain.[16]

Post-Mortem Nen

The death of a Nen user does not necessarily result in the cessation of their abilities; on the contrary, it may cause pre-existing abilities to become even more powerful. The most common reason for this phenomenon to occur is the ability of the dying user while harboring a strong grudge will cause their Nen to seek out the object of their hatred and cling to it. This makes curse-type abilities much more difficult to remove, to the point that fewer than ten Exorcists in the whole world were deemed capable of lifting a curse left by the deceased.[17]

131 - Terpsichora Neferpitou

Terpsichora manipulates Neferpitou's headless corpse

It seems that other than hatred, any powerful enough emotion can result in post-mortem Nen: Neferpitou’s Terpsichora took control of their beheaded corpse out of loyalty to the King, even though the Royal Guard did not consciously perceive Gon as a threat due to believing him to have given up all of his potential to kill them.[18] Some Nen users go as far as to make their own death an activation requirement, which, despite their demise being only temporary and programmed, still grants their abilities greater power than normal.[19][20] Death can also cause Nen abilities to linger even if their doing so violates the conditions of other abilities: a notable example is The Sun and Moon, which remained in Chrollo’s book despite the creator passing away and, if applied to a conjured object, the object cannot be dispelled until the marks explode,[21] both of which are in explicit contradictions of conditions of the Spider’s Skill Hunter.[22]

Nen and Nature

Affinity with nature is connected to sensitivity for aura.[23] Wild animals are more perceptive in that regard than humans, and may learn Zetsu spontaneously.[24][25] However, only humans and certain Magical Beasts have displayed the ability to open their Aura Nodes and use Nen. Honing one's Nen abilities has the side effect of attuning them with nature to a greater degree, enabling the user to detect sounds, scents, and tracks non-users would miss, as well as to attract wildlife, this has led to the belief that good Hunters are well-liked by animals.[26]

118 - Youpi powers up

Youpi, who has no human genes, releasing his aura

After the Chimera Ant Queen who came to the Human World from the Dark Continent began to feed on humans, she spawned offspring with the innate ability to see aura, namely some Officers[27] and the Squadron Leaders.[27][28][29] The Royal Guards[29] and the King[30] were able to freely control their Aura Nodes and flow from birth. Menthuthuyoupi developed Hatsu abilities despite having no human genes, only those of a Magical Beast.[31] Nanika's wish-granting power is also known to work through aura.[32][33]

The Unknown

Though Nen is influenced by one's mental condition and emotional state, it is difficult to judge exactly to what extent these factors affect Nen. Biscuit Krueger became capable of altering her appearance without actively training for it, instead wishing for her body to change for years, which caused the changes to manifest little by little.[34] It is also unclear just how subjective and dependent upon one's capacity to assess risk certain ability conditions and Limitations are.

Inscription anime

The mysterious inscription on Ging's metal box

Another mystery is the exact relation between Nen, the Divine Script and a seemingly different type of inscription. The Divine Script has the power to strengthen the Nen abilities of the one who drew it, provided it is charged with their aura and the user remains in its proximity;[35] the latter inscription was noted to have similar properties to Nen and the ability to reinforce whatever it is applied to, but cause it to break as soon as it comes in contact with aura.[36] Interestingly, it might have been used on a handcuff designed to restrain a Nen user.[37] Just like the Divine Script, this inscription appears to require aura to function.[15]

Nen in Society

Nen is a power unknown to the public at large, with only a minority of humans being capable of using it or even privy to its existence. It is in fact not uncommon for high-ranking members of a country's army to be completely unaware of it,[38] In general, Nen is also not admissible as evidence in judicial proceedings.[5] Individuals who learn it tend to avoid attracting too much attention in order to prevent society from spiraling into chaos.[4]

Nen and the Hunter Association

Acquiring control over one's aura flow is the final step to becoming a professional Hunter,[3] as per the second Hunter Bylaw.[39] According to Wing, this is because Hunters need to be deterrents for crime. However, since Nen could be extremely disruptive to society, it was deemed unsafe to include it as a publicly-known criterion and an official part of the Hunter Exam, and is therefore known within the Hunter Association as the "Secret Hunter Exam".[3] Accordingly, many high-profile jobs contracted to the Hunter Association list knowledge of Nen as a minimum requirement.[40] A licensed Hunter may not reveal the existence of Nen to those who do not know about it, although it is possible to relay this information in times of emergency.[41]

Many Hunters are proficient Nen users, with Isaac Netero, the 12th Chairman of the Hunter Association,[42] being revered as the world's most powerful Nen master in his prime.[43] Since mastery of Nen leads to attunement with nature,[23] this has led to the credence that good Hunters are well-liked by animals.[26]

Geniuses

Geniuses Around The World

Some of the world's most famous and influential people have naturally learned Nen

Nen is like any other skill, in that there are those who can learn it faster than others. Some are able to discover and learn to manipulate their aura on their own without having formally learned it. These individuals are typically known as "geniuses", "psychics", or "superhumans" to the public. This can be anything from inadvertently being able to use the basic techniques of Nen[6] or unconsciously developing a unique Nen ability that can be used without really understanding how or why one is able to do so. Typically, geniuses of Nen are exceptional artisans in their own fields and their abilities are related to them.[44]

Notable geniuses within the series include:

Four Major Principles

Nen Principles

The four major principles of Nen

In order to fully grasp Nen, one must first learn the Four Major Principles of the Shingen-ryu school of kung fu. Everything else, including a practitioner of Nen's individual skills, is based on the basic manipulations of one's aura flow. The Four Major Principles, in order of study, are: Ten, Zetsu, Ren, and Hatsu.[1]

These basic techniques become second-nature to those experienced in Nen. For example, a beginner must learn to use Ten and concentrate to maintain it; whereas someone with experience will practically always be in a state of Ten, even during sleep.[6]

Ten

Gon Ten

Gon using Ten

Once a person has opened their Aura Nodes, they must learn to keep their aura from leaking away from their body. Ten (纏, Envelop; Shroud) is the process of keeping the nodes open, but also having aura flow through and around the body rather than away from it. Once maintained, it creates a shroud around the user that feels similar to standing in lukewarm, viscous fluid. Ten maintains youthful vigor and reduces one's aging, since the energy powering the body no longer leaks away; one can keep the body from breaking down and deter the aging process.[1] Ten is the most basic defense against emotional Nen attacks,[1] and it also offers limited protection against physical attacks,[13] but hardly any when said attacks are enhanced with aura.[14] Through frequent meditation and practice, one can improve the quality of their Ten and even maintain it in their sleep.[6] Once it has been learned, it will never be forgotten, much like cycling and swimming.[15] Despite being the most elementary technique of all, Ten is also one of the most important, since, together with Ren, it plays an instrumental role in determining the strength and smoothness of a Nen user's aura flow.[48][49]

Zetsu

Killua Zetsu

Killua using Zetsu

While Ten allows a user to keep aura from leaking away from their body, Zetsu (絶, Suppress; Null) stops the flow of aura from their body altogether. By closing all of their Aura Nodes, the user is able to halt all outflow of their aura like water from a valve, making their presence much harder or even impossible to sense.[1] Shutting off the nodes in their eyes prevents the user from being able to see aura,[50] but, since they are no longer surrounded by their own aura, they become more sensitive to the aura of others.[14] The enhancement in perception is such that Zetsu can counter In, although it is not advised to employ it this way.[15] This technique is thus doubly useful when tracking another person, as not only it will make it easier to follow them, it will also prevent other users of Nen from noticing their pursuer. However, there are other ways to perceive a person hiding with Zetsu: aside from the five senses being effective, particularly perceptive individuals are capable of detecting the gaze of another person, although they might not manage to discern the position and number of onlookers.[51] Furthermore, if Zetsu is utilized within a certain range from a Nen user, that Nen user might notice their presence disappearing, especially if the Zetsu user's aura is powerful.[52] Despite the technique not affecting vision directly, activating Zetsu in front of someone else will give them the impression the user has turned transparent.[51]

Zetsu can also be used to relieve fatigue, since it forces the body's external layer of aura to be fully contained within.[1] However, for the same reason it can be dangerous due to it leaving the body defenseless against any aura attack. Even a weak attack enhanced with Nen could do massive damage.[14] Since even the thin protection offered by Ten is gone, a Zetsu user is particularly susceptible also to hostile emotional attacks,[2] resulting in their mind becoming as vulnerable as their body.

Ren

Gon Killua Zushi Ren

Gon, Killua, and Zushi using Ren

Ren (練, Refine; Enhance) focuses on outputting a larger amount of aura than Ten, projecting it outwards explosively.[1] This amplifies the user's physical strength and durability and provides a large pool of aura for any advanced techniques or individual skills they decide to use, albeit at the cost of expending said aura. One can train their Ren to extend its duration and increase the amount of aura at their disposal. It is said it takes one month to prolong one's Ren outside of combat by 10 minutes.[53] If Ten is considered purely defensive, Ren can be regarded as its offensive counterpart, although it also grants the user vastly enhanced defensive abilities.[54] With the right timing, Ten can be used to contain the aura produced with Ren.[55]

By tingeing one's Ren with hostility, a Nen user can exert what is colloquially referred to as "bloodlust". A prolonged emission of malicious Ren can induce uncontrollable dread in those who cannot use Nen, paralysis and, if contrasted without Ten, even death. On the other hand, a neutral Ren can rarely be felt by non-users.[1] Since Ren is a show of power, it can also intimidate other Nen users, as it offers an approximate measure of the user's raw strength;[56] in fact, by "show me your Ren", Hunters generally mean they want to see the fruits of one's training, such as a Hatsu ability, rather than their Ren per se.[57] In most cases, Ren reflects the user's hostility without their control, and it can even leave faint traces in the environment after the Nen user has left the scene.[58]

Hatsu

Hunterxhunter 28 07x

Wing using Hatsu

Hatsu (発, Release; Act) is one's personal expression of Nen. Its qualities are influenced by but not restricted to the Nen user's natural Nen category, one of the six available, which is decided by nature and nurture. Hatsu is used to project one's aura to carry out a certain function, creating a special and unique paranormal ability that is colloquially called "Nen ability", "Hatsu ability", or simply "Hatsu".[3]

At first, Hatsu appears simply as a consequence of using Ren during Water Divination; however, it is more than a mere property of the latter, and it can be trained individually either through Water Divination itself, which however seems to only affect the user's natural category,[3] or by honing one's skills in a Nen category via specific exercises.[59] Once a certain level of skill has been attained, the student can attempt to create their personal Nen ability. Since they can have an immensely vast range of effects, Hatsu abilities may be recognized as any manifestation of one's Nen that cannot be ascribed to one of the basic or advanced techniques, although there are instances of Nen abilities being essentially applications of Ko (an advanced Nen technique which however makes use of Hatsu) with special conditions or restrictions.[60] A good Hatsu ability reflects a person's own character, regardless of its complexity; one can never truly master Nen if they only copy someone else's abilities.[15]

Advanced Techniques

After acquiring a working command of the basics, a student is introduced to a series of advanced techniques that often combine and/or derive from the four Major Principles. These techniques expand the user's options in combat manifold, but they also consume more aura than the Four Major Principles.[61]

Gyo

Zushi Gyo 2011

Zushi using Gyo

Gyo (凝, Focus) is an advanced application of Ren by which a Nen user concentrates a larger than normal portion of their aura into one specific body part. It increases the strength of that one body part, but leaves the rest of the body more vulnerable. Gyo is most often used in the eyes, allowing a Nen user to see aura and Nen constructs concealed with In[15] as well as traces of aura that so faint that they might go unnoticed otherwise.[44]

An alternative version of this technique gathers only the aura naturally leaking from the body instead of the greater amount produced with Ren. This application of Gyo can still increase the amount of aura in one select body part and thus its power, but the output is much lower than what is obtained through the regular technique.[62] It is unlikely this lower-consumption Gyo could counter In, since Wing had all his students perform Ren to do so.[15] However, it has proven to suffice to see thin layers of aura[44][48] as well as to perform Water Divination correctly.[63]

In

Uvogin in Chains

Uvogin trapped within Kurapika's chains, concealed from view through In

In (隱, Conceal) is an advanced form of Zetsu used to render one's aura imperceptible, effectively concealing it. Unlike Zetsu, however, In does not stop the user's aura flow; instead, it hides it,[15] making it impossible to perceive with any of the five senses or extrasensorial perception. Hence, this technique is perfect for launching sneak attacks or laying traps, as it can conceal not only the user's presence,[64] but also Nen constructs generated with Emission, Transmutation,[15] or Conjuration.[64]

In can be countered by using Gyo in the eyes or through Zetsu.[15] Since In conceals part[65] (or even all)[15] of the user's aura output, experienced Nen users can divine their opponent is using it if little or no aura can be felt from them in circumstances which would normally require it, such as during combat.[65]

En

EN 2011

Nobunaga using En

En (圓, Circle) is an advanced application of Ten and Ren.[66] In Ren, aura usually envelops only a small amount of space around the user's body. En is when one extends their Ren so that their aura extends further than normal, then uses Ten at the same time to contain and give shape to that aura, normally a sphere. The minimum requirement is to extend one's aura to a radius of more than 2 meters (6.56168 feet) and hold it longer than 1 minute.[67] Someone using En can feel the shape and movement of anything within the area covered by their aura, with the degree of awareness and finesse depending on their level of skill.[66] Nen users can be told apart from regular people due to their stronger reaction to the En user's aura.[68] Zetsu can suppress a Nen user's response, making their position more difficult to pinpoint, but not their movements.[69]

Those who master En are typically able to extend it to a circle with a 50 meter (54 yard, 2.0421 foot, 0.5052 inch) radius.[66] There are exceptions, however: Zeno Zoldyck, one of the most powerful assassins alive, is able to extend his En up to a radius of 300 meters (328.084 yards),[58] while the Chimera Ant Neferpitou has an irregularly shaped En and can extend a tendril up to 2 kilometers (1 mile, 427 yards, and 8.0064 inches).[69] The downside to this technique is that it is extremely tiring and draining for the Nen user to constantly deploy so much aura.[58] Furthermore, it is not always possible to distinguish between living beings and Nen constructs.[70]

Shu

Gon Shu

Gon using Shu

Shu (周, Enfold) is an advanced application of Ten. Shu allows a user of Nen to enshroud an object with their aura, allowing them to use that object as an extension of their own body. For example, one could use Shu to extend their Ten around a weapon, which would strengthen and protect it.[61] Shu can be combined with other techniques, such as Ko.[59]

Ko

Biscuit ko 2011

Biscuit using Ko

Ko (硬, Temper) is a combination of Ten, Zetsu, HatsuRen, and Gyo in which all of the user's aura is concentrated into one particular body part.[60] Gyo is utilized to focus aura on a part of the body, while Ten is used to prevent it from dispersing. Zetsu is used to completely stop the flow of Nen in all other parts of the body, increasing the output in the desired area. With Ren, the amount of aura is increased even further.[62] This makes that one body part extremely powerful, but at the cost of leaving the rest of the user's body completely unprotected. Due to the risk it carries, Ko is regarded as a purely offensive technique.[60] An incomplete version of this technique can be utilized without Ren, primarily to master the other steps before increasing the amount of aura to concentrate and contain.[62] Some Nen users, Enhancers in particular, employ Ko as a Nen ability by adding conditions to it.[71]

Ken

Gon Ken

Gon using Ken

Ken (堅, Fortify) is the advanced version of the basic Ren and Ten techniques. It is a primarily defensive technique where a Nen user maintains a state of Ren for a prolonged amount of time.[60] The amount of aura surrounding the user's body during Ken is about 10 times higher than during Ten.[72] Ken allows a Nen user to guard against attacks from any direction, but the large amount of aura produced makes it tiring to maintain. It is considered the best option to defend from Ko, despite not being as powerful as the latter on any given part of the body, as it protects all of it evenly.[60] When not immediately at risk of being struck with Ko, Ken is utilized when one wants to be cautious.[73] Some Nen users choose to expand its radius so as to sense incoming attacks they are unable to see,[74] as a miniature En of sorts. Sometimes Ken is colloquially called Ren owing to the similarities between the two techniques.[60]

Ryu

Biscuit's Ryu

Biscuit using Ryu

Ryu (流, Flow) is the term for use of Gyo from a state of Ken to perform real-time offensive and defensive value adjustments. If Ko devolves 100% of one's aura to offense or, much more rarely, to defense, and Ken splits it evenly between the two, Ryu is redistributing one's aura according to any other percentage, for example by focusing 70% of one's aura in one fist as one is about to strike, or 80% in one's leg to block an incoming kick. It is utilized to damage a Ken user without leaving oneself as unprotected as during Ko, although the power of the technique is lower. Ryu is difficult to master, as it requires not only to control one's aura flow with great precision, but also to be able to estimate the amount of aura utilized by the opponent at a glance.[72] Even the technique is performed correctly, the movements of the aura flow risk giving away the user's next move if they are too slow.[73]

Nen and Individuality

There are six types of aura; every individual is born having one of these six different aura types. Upon learning one's own aura type, a student of Nen can set about learning to apply the technique in a unique way that suits their personality, which can develop into a unique skill.

Nen Types Diagram

Compatibility between Nen types

There are numerical approximations to indicate just exactly how efficient one would be at using aura abilities that one is not born into. Starting at one's own aura type, one has the potential to be 100% efficient at using abilities based in that category alone.[75] Then looking at the category chart (see right), one has the potential to be 80% efficient at using aura types adjacent to one's primary type, 40% efficient at the opposite or farthest category, and 60% efficient in the two remaining categories. Specialization is typically unusable for non-Specialists because it is impossible to partially use; one either can or cannot use Specialist abilities. However, it is possible to turn into a Specialist later in life, with Conjurers and Manipulators having the highest chance of succeeding.[16]

Water Divination

Learning by Water Divination

Water Divination

The most popular way (and the only sure-fire way seen in the series) of determining one's aura type is through Water Divination (水見式, Mizumishiki). Divination requires one to float a leaf atop a glass of water. A student of Nen will place their hands around the glass and perform Ren[3] (or focus a greater than normal amount of aura in their hands, such as through Gyo).[63] The resulting effect from one's aura contacting the glass will determine a person's aura type.[3]

  • If the volume of the water changes, the user is an Enhancer.[3]
  • If the taste of the water changes, the user is a Transmuter.[3]
  • If impurities appear in the water, the user is a Conjurer.[3]
  • If the color of the water changes, the user is an Emitter.[3]
  • If the leaf moves on the water's surface, the user is a Manipulator.[3]
  • If a completely different change appears, the user is a Specialist.[3]

It is best to base a Nen ability on one's individual aura type. Though it is possible for one to develop abilities outside of his primary aura type, one is typically less proficient at using those abilities. By creating an ability that one isn't suited for, one risks stagnating their potential by overloading their capacity for using Nen[3] something Hisoka calls "Memory Overload". However, there are examples of Nen masters, such as Biscuit Krueger and Isaac Netero, who have reached a high level in multiple categories and employ them consistently in their primary Hatsu abilities. In fact, according to Biscuit, training in all the accessible categories is the fastest and most efficient way to improve one's skills in one's own Nen type, with the additional benefit of increasing one's flexibility and proficiency in Nen in general. A bell curve is the ideal shape, with the time spent on each category decreasing the farther away said type is from the user's natural one.[76]

Hisoka's Personality Test

Hisoka claims that he can judge a person's Nen type based on their personality. According to him, all people of one aura type are generally of the same personality type. However, by his own admission this method is no more reliable than trying to discover someone's zodiac sign or blood type just from personality analysis.[77] According to his theory:

  • Enhancers are simple and determined.[77] Most of them never lie, hide nothing, and are very straightforward in their actions or in their thinking. Their words and actions are often dominated by their feelings. They are generally very selfish and focused on their goals.[citation needed] This is reflected in their Nen as enhancers typically rely on simple and uncomplicated Hatsu techniques.
  • Transmuters are whimsical, prone to deceit, and fickle.[77] Transmutation users have unique attitudes, and many are regarded as weirdos or tricksters. Often they put forth a facade while hiding the truer aspects of their personalities. Even when they don't hide their personalities they rarely reveal their true intentions.[citation needed] Many Transmuters rely on techniques that give unique and unpredictable properties to their Nen that reflects their personalities.
  • Emitters are impatient, not detail-oriented, short-tempered, and quick to react in a volatile manner.[78] They resemble the Enhancers in building their impulsivity, but the difference between them is that Emitters probably tend to calm down and forget easier.[citation needed] Because of the nature of Emission, many Hatsu techniques created by emitters are primarily long range.
  • Conjurers are typically high-strung[78] or overly serious, stoic, and nervous. They are often on guard as to be cautious. They are very observant and logical, rarely falling into traps. Being able to analyze things calmly is the strength of Conjurers.[citation needed] Many of the items that conjurers create are often used by them in a very deliberate and practical, logical fashion.
  • Manipulators are argumentative and logical. They advance at their own pace[78] and tend to want to keep their families and loved ones safe. On the other hand, when it comes to pursuing their own goals, they do not listen to what others might have to say about it.[citation needed] While manipulators often use techniques that allow them to control their opponents, some choose an inanimate medium to control.
  • Specialists are independent and charismatic.[78][79] They won't say anything important on them and will refrain from being close friends, but, because of their natural charisma that draws others, they are always surrounded by many people.[citation needed] Because Specialization is unique and can have many facets, most Specialists possess only one Hatsu technique.

Telltale Signs

Furykov was able to construct a system to identify Nen users[80] and their Nen types[81] through observation alone, which he claimed is the result of his experience. According to him, a way to differentiate between Nen users and non-users is that the outline of the former's iris, when looked at from the side, appears discontinuous.[80] One of the shortcomings of this method is that it cannot tell Nen users proper apart from individuals who have only "half awakened".[5]

A person's Nen category can be determined through some habits of theirs and the flow of their Ten:

  • Enhancers and Transmuters, depending on their level of skill, have a soft, quiet Ten that shrouds the part of their body that activates their favorite attacks.[81]
  • Emitters and Manipulators generally have a broader Ten, and if they attempt to shrink it, their aura will appear darker. Manipulators also tend to want to keep their dominant hand free, as it is generally the one used for their abilities.[81]
  • Conjurers have strong aura around the part that activates their favorite abilities, and a much gentler flow everywhere else. Like Manipulators, they will also prefer to keep their dominant hand free.[81]

Aura Types

Enhancement

JankenRock

As an Enhancer, Gon can strengthen his fists

If a student increases the quantity of water in the glass during their Water Divination, they are an Enhancer (強化系, Kyōkakei). Enhancement is the ability to use aura to increase the natural abilities of an object or one's own body.[3] Therefore, Enhancers are able to greatly increase their physical attack and defense and are best suited for melee combat.[16] Proficient Enhancers who also take good care of their body can make it more durable than tanks[82] and generate the force of a small missile with one blow.[83] It is rare to find male Enhancers with supportive abilities, since most of them look to increase their combat prowess.[12]

Enhancement is the most balanced category, allowing users to spread themselves evenly between offense and defense and become very powerful using only simple abilities. Examples of more complex Enhancement abilities include enhancing one's healing factor[16] or boosting the target's growth.[12] However, it is a common belief that Enhancers generally do not need special techniques as their natural category already has the best balance between attack and defense as its primary attribute.[48] This might play into why most Enhancement Hatsu abilities in the series appear to be mere applications of basic and/or advanced Nen techniques at first glance due to the lack of requirement to manage between pros and cons on an overall scale during their development. Affinity for this category in fact plays a crucial role in combat at all times, even when Hatsu is not being used.[16]

Notable Enhancers include:

Transmutation

Killua transmuting electricity

Killua can transmute his aura into electricity

If a student changes the taste of the water in the glass during their Water Divination, they are a Transmuter (変化系, Henkakei). An affinity for Transmutation means a person can change the properties of their aura to mimic something else, or only specific attributes.[3] Altering the shape of one's aura falls in this Nen category too.[84] Similar to Emission, constructs created via Transmutation are pure aura, therefore they are invisible to individuals incapable of using Nen. Transmutation is often mistaken for Conjuration due to their similarities. The difference is that Transmutation allows the user to mimic the properties of a substance with their aura, whereas Conjuration changes aura into the actual substance.

Transmuters are not limited to copying the properties of solid matter. For example, Killua Zoldyck uses his aura to copy the properties of electricity.[57] Transmuters can also give their aura certain properties instead of replicating the characteristics of a substance in their entirety: Hisoka's Bungee Gum mimics and combines the properties of rubber and gum, and it is several times more flexible, sticky and durable than the real thing.[85]

Notable Transmuters include:

Emission

Nen Emitted Ball

Razor emits a ball of Nen

If a student changes the color of the water in the glass during their Water Divination, they are an Emitter (放出系, Hōshutsukei). An affinity for Emission means that a user has an easier time separating their aura from their body.[3] Aura usually decreases in intensity very quickly when it leaves the source body, but adept Emitters can separate their aura from their body for long periods of time, over long distances, and still be able to maintain it and its functions. Emission is also required to manifest the effects of certain abilities away from the user, and to preserve those of Transmutation and Enhancement abilities after the construct or medium is separated from the user's body. An advanced application of this Nen category is teleportation.[86] Emission might also be involved in rendering one's aura able to phase through matter.[87]

Emitted aura appears to cap the user's output,[88] and the more aura is separated from the user's body, the shorter the distance it can travel from the user.[89] In some cases, users have shown the ability to recover emitted aura; thus far, this has only occurred when Manipulation was also involved.[88][90]

Due to its properties, Emission is typically employed in abilities with emphasis on range and/or those that have a long-lasting effects. Basic applications include shooting out projectiles or beams of aura at high speed.[3] While this method is primarily used to attack, it can also be used to propel oneself.[91] More skilled Nen users can combine this category with Manipulation in order to create Nen beasts.[92] Some Emission abilities (such as Shachmono Tocino's, Razor's, and Goreinu's) are commonly mistaken for Conjuration abilities. The two, however, are fundamentally different, as constructs generated by Emitters are created solely from aura, and are invisible to those who have not learned Nen.

Notable Emitters include:

Conjuration

Kurapika Chains

Kurapika conjures a chain

If a student creates an object in the water in the glass during their Water Divination, they are a Conjurer (具現化系, Gugenkakei). In most cases, Conjuration is intended as the ability to create a physical, independent, material object out of one's aura;[3] however, users of this category can also create laws and principles and affix them to a specific area.[86] The durability of a conjured object can generally be taken as a measure of the user's skill, although conditions can be used to strengthen it.[16] Once a person has mastered the materialization of a certain object, they can conjure it and dispel it in an instant, whenever they want.[93] However, even if one were to completely master this Nen type, there would still be objects they could not materialize, such as swords that can cut anything, as they go beyond "human capacity". Izunavi vaguely described it as the inability to conjure objects overly supernatural.[16]

Conjured objects can in fact possess special abilities. For instance, the Phantom Troupe thief, Shizuku, is able to conjure a vacuum cleaner that can infinitely suck up objects, but with the condition that it cannot suck up living things and things made out of Nen.[94] Similar to Manipulation, Conjuration abilities tend to be very specific, complex, and conditional. Conditions can be imbued into conjured objects to make them stronger. Kortopi, for example, is able to materialize a perfect inanimate copy of any object or person that he touches. However, the copies of all objects generated will automatically disappear after 24 hours.[95] By resorting to Limitations, a Conjurer can take their ability a step further and materialize objects with properties that come even closer to exceeding human capacity, although they still cannot surpass it.[16]

Conjuration is the only way in which Nen can create things that ordinary people (unaware of Nen) can see and touch, unless they are hidden from the senses with In.[64] Furthermore, objects or entities created by this technique have a subtle "independence" to them: under certain circumstances, they can continue existing even if they were at a considerable distance from the Conjurer,[96] or even if the Conjurer themselves are not aware that they have yet to be de-materialized.[65] Some Conjurers have also exhibited the capacity to alter the length and size of a materialized item.[97][98]

Notable Conjurers include:

Manipulation

Shalnark Manipulation Nen

Shalnark uses manipulation abilities to control others

If a student moves the leaf floating on the water in the glass during their Water Divination, they are a Manipulator (操作系, Sōsakei). Abilities belonging to Manipulators allow the user to control living or non-living things, including aura constructs. The main advantage of this category in combat is the ability to manipulate the enemy themselves.[3] Abilities of this type are especially feared, since the fight can be brought to an end as soon as the conditions are met.[99] The aura of the ability user mixes with the target's, although it is not normally noticeable.[12] The degree of control is, for the most part, determined by a condition that may or may not put the Manipulator at a risk or a disadvantage (such as attaching objects on the enemy, touching the enemy in a certain way): the higher the difficulty for the condition to be achieved, the better the degree of control. However, it is impossible to control a target that is already under the effect of Manipulation Nen.[100]

Manipulators are the Nen users who can pour the most aura into an object.[64] In many cases they are seen capable of inflicting and maintaining the effects of their abilities from afar, seemingly without the aid of Emission-type Nen, most commonly with the aid of a specific medium.[101][102] The complexity of the orders assigned also depends on the target: sentient beings and machinery can carry out more complex tasks, as opposed to simpler, inanimate objects.[14] Manipulation of the highest class is capable of semi-forcing the Aura Nodes of a non-user to open.[12]

There are multiple types of mind control:

  • Soliciting (要請型(ようせいがた), request type) Manipulators leave the free will of the victim intact, but condition them into working in their favor. An example of soliciting-type ability is rewriting the target's memories. An advantage of this type of control is that it can potentially be used on several targets by consuming only a small amount of aura. Halkenburg Hui Guo Rou's Guardian Spirit Beast is presumed to employ this type of Manipulation Nen.
  • Coercive (強制型(きょうせいがた), compulsion type) Manipulators exert total control over the victim, taking over both their mind and body.
  • Pseudo-coercive (半強制型(はんきょうせいがた), half compulsion type) Manipulators either take over the body of the victim or trap them into a situation where they have no choice but follow the Manipulator's orders. Momoze Hui Guo Rou's Guardian Spirit Beast employs this type of Manipulation Nen.[5]
  • The specifics of induction type (誘導型(ゆうどうがた)) Manipulation have yet to be explained in detail. It was described as weakly coercive but capable of influencing a large number of people, which it was seen doing by affecting their emotions towards a certain object. Salé-salé Hui Guo Rou's Guardian Spirit Beast is known to exercise thus type of mind control.[86][103]

Notable Manipulators include:

Specialization

Lovely Ghost Writer 2011

Neon using her fortune telling ability

If a student causes some other effect during their Water Divination, they are a Specialist (特質系, Tokushitsukei).[3] Specialization could be broadly defined as anything that does not belong in any of the other five categories, making it the vaguest Nen type. Accordingly, its effects are wide-ranging: some influence Hatsu itself, for example by appropriating others' Nen abilities[48] or by altering affinities,[16] while others allow the user to garner knowledge that would be unattainable through other means, such as about past[104] or future events;[105] others have completely different effects.[106] Consequently, Specialists are not as much at a disadvantage as users of other Nen types if their category is revealed.[107] Only Specialists can use this Nen type. It is possible to become one later in life, although it is more likely for Manipulators or Conjurers, which is why this category is placed at the bottom of the Nen chart. Since its position is dictated by a factor other than the affinity for other Nen types, it is currently unclear if it has the same acquisition rates as other categories, although it should be noted the presence of Specialization in the chart affects other Nen types regularly.[16]

It is currently unknown how Specialists develop their Nen abilities. In Neon's case, she obtained an ability that she had been wishing for since she was a child,[108] while Tserriednich manifested his own one week after being initiated to Nen and without trying or even being aware of it.[109] It seems that a Specialist's manifestation of Hatsu during Water Divination reflects their character and may thus give some insight into the general direction in which they might or should develop their ability,[63] since Hatsu is profoundly affected by personality,[110] although the information received this way is vague enough that it is impossible to pin down just what kind of ability a Specialist has already developed through their results during the Water Divination test.[107]

Of the many possible effects that can occur during a Specialist's Water Divination,[3] only three have been shown so far: Neferpitou's aura caused the leaf on top of the water to dry out and crumble;[110] Tserriednich's caused the water to boil and a putrid smell to be released;[63] and Kurapika's caused the water to change colors and the leaf to spin.[107]

Notable Specialists include:

Subcategories of Nen Abilities

Regardless of their type, some Nen abilities share common traits that allow them to be grouped in recognizable subcategories.

Clone

True tiger bite fist 2011

Kastro's Double may be a type of clone

A clone (分身, bunshin) is a conjured copy of the user which is then controlled via Manipulation. Automatic clones do not require the user's focus, but they cannot carry out complex orders; vice versa, clones which are directly controlled by the user allow for greater precision, albeit at the cost of stricter conditions.[11]

Notable clone users include:

Kastro's Double may also be considered a clone.

Collaborative Type

The exact nature of collaborative type (共存型(きょうぞんがた), coexisting type) abilities is still unknown, but a "partner" is necessary for their usage.[34]

Notable users of collaborative type abilities include:

Compound Type

The exact nature of compound type (系複合型(けいふくごうがた), composite type) abilities is unclear. They appear to grant a variety of Nen abilities, or at least to activate a number of different effects, when certain conditions are met.[63]

Notable users of collaborative type abilities include:

Counteractive Type

Chap 373 - The Cat That Lived a Million Times

Camilla's retribution on her attacker

Counteractive (迎撃型(カウンタータイプ), counter type) Nen abilities activate after the user takes damage and return it to the assailant.[20] Since the ability user strikes second, they run more risks, which increases the power of the ability.[34] The greater the damage suffered, the stronger the ensuing counter. The most effective ways to neutralize a counteractive-type Nen user are to incapacitate them without injuring them or to kill them with one blow; however, some of them can even utilize death as an activation condition.[20]

Notable users of counteractive abilities include:

Feitan's Rising Sun also seems to fulfill the criteria of the counteractive type.

Curse

JudgmentChain

Judgment Chain around a victim's heart

A curse (呪い, noroi) is an application of Nen that is detrimental to the one upon whom it has been placed. Such curses are considered dangerous due to their long-lasting effects. The death of the caster may end up strengthening the curse, instead of weakening it. Curses may disappear if certain conditions are met by the cursed, but they can also be removed through the use of Nen.[17]

Notable curse casters include:

Abilities with similar effects to Judgment Chain are Genthru's Countdown and Knuckle's Hakoware, and like the former they can be lifted only by an Exorcist.

Diffusive Levy Type

Diffusive levy type (拡散・徴集型(かくさんちょうしゅうがた), scattering/collecting type) abilities gather something from multiple targets through several agents. For example, a diffusive levy type Nen beast can summon other Nen constructs to absorb aura from numerous people at once.[34]

Notable diffusive levy type ability users include:

Exorcism

Wooden Effigy

Abengane's exorcism which uses a wooden effigy

Those who possess the ability to lift curses are called Exorcists (除念師, jonenshi), but are rare among Nen users. The Hunter Association may have only one among its members. There are fewer than 10 people in the entire world whom are powerful enough to exorcise Nen curses left by the dead.[17]

Notable Exorcists include:

Rihan's Predator also shares many affinities with exorcistical abilities.[86]

Haunting Type

Haunting type (呪慿型, juhyou-gata) abilities activate after the death of the user to possess a specific target and bring them harm in a variety of ways. Abilities of this type are most commonly, if not exclusively, curses.

Notable users of haunting type abilities include:

  • Private Guards of Prince Camilla Hui Guo Rou[112]

Loan Type

Loan type ((たい)()(がた)()()()()()()(), Taiyo-gata) abilities allow the user to transfer a Nen ability to someone else so that they can use it instead.

Notable users of loan type abilities include:

Nen Beast

Goreinu's Alabaster Sage & Obsidian Sage

Goreinu summoning his two "Sages"

A Nen beast (念獣, Nen-jū) is an artifact made out of aura endowed with some degree of agency.[92] Its abilities and degree of autonomy vary greatly depending on the Hatsu ability that created it and the user's skill.[113] Nen beasts generally have anthropomorphic or animal appearances, but that is not always the case.[114] The term has been more commonly used to refer to constructs generated with Emission and controlled with Manipulation,[92] but there are also instances of conjured Nen beasts.[115]

Some Nen beasts have the ability to multiply themselves. Broadly speaking, this serves one of three goals:

  1. Increase the number of allies and control them;
  2. Decrease the number of enemies;
  3. Steal something from those who are affected by the Nen beast in order to strengthen it or its creator.[86]

Notable users of Nen beasts include:

Razor, Shachmono Tocino, KiteKnuckle Bine, Musse, and Rihan might also make use of Nen beasts.

Parasitic Type

See also: Guardian Spirit Beast

When a Nen user bestows a Hatsu ability onto another person, that ability is said to be of the parasitic type (寄生型, kisei-gata). Parasitic type abilities are similar to curses and are often conjured. They utilize the host's aura to invoke their abilities. Many of them are conjuration based but they can come in other forms as well. They act without the host's awareness or control, defending him/her and, in rare cases, attacking. The person who receives the ability may not even be aware of it or be a Nen user, in which case they will be unable to see the ability. The latter case is the most favorable for parasitic Nen, as the host will be unaware of their aura being drained and will only feel tired.[114] Many abilities of this type feed off the emotions of the recipient as well as of those of the people around them, resulting in complex, unpredictable Nen constructs.[117] 

Notable users of parasitic Nen include:

Notable hosts of parasitic Nen include:

Supportive Type

Supportive (()(じょ)(がた)()()()()()()(), Hojo-gata) abilities appear to be those abilities that are not aimed at increasing the user's combat strength, which makes this class considerably vast. The only confirmed ability of this type is Bill's Erigeron, which uses Enhancement to induce the growth of his target.[12]

Symbiotic Type

Golem Symbiotic Type Arm

Golem's symbiotic-type arm

Some abilities are collaborative in that they require multiple Nen users to donate aura[2] or perform each a different task to be effective. The power of the resulting ability is greater than what the Nen users involved could achieve individually. Such abilities are classified as symbiotic type or joint type (相互協力型(ジョイントタイプ), mutually cooperative type). An example of symbiotic ability is conjuring a weapon which is then loaded and fired by another Nen user, such as an Emitter.[87] A subcategory of symbiotic type abilities acts on whole groups and is therefore classed as "party form" (集団行動形式(パーティーフォーム), group action form).[34]

Notable joint type Nen users include:

Tsubone[119] and Morena Prudo[120] may utilize this type of sub-ability as well, the latter in party form. Countdown may also have symbiotic elements in its remote detonation, since, despite it being Genthru's ability, two more people are necessary to activate this aspect of it.[76]

Nen and Risk

113 - Shoot smiling at Youpi

Shoot covers his eye to increase risk

Together with emotion, risk (リスク) is one of the factors which has a remarkable effect on Nen. Self-imposed stipulations that are harmful or potentially so to the creator, such as willingly limiting the use of their senses, can increase the power of their Nen, and of their Hatsu abilities in particular.[121] This is because Nen is an expression of willpower, and willingly taking extra risks confirms the Nen user’s resolve.

It is interesting to note that while it is enough to feel certain emotions for them to affect one’s aura, determination becomes a factor only when manifested through the addition of conditions: for example, while Kurapika always had the resolve to fight the Phantom Troupe even at the cost of his life, it was only when he decreed that he would die if he used Chain Jail on someone other than a Spider that he was able to create the ability.[16] The reverse is also true, with restrictions granting greater power to a Nen user even on occasions where they run no risks, such as when Gon charged his Rock to acquire "King White Stag Beetle"[122] and during the dodgeball match against Razor.[123]

Vows and Limitations

Self imposed restriction

Vows and Limitations

Being a product of the mind, Nen responds to the goals, strengths, and desires of individual users. As a result, a student of Nen can increase the overall power of an individual skill by stating a self-imposed restriction that forces even more conditions on it. For example, if one consciously decides something along the lines of "I will only use this skill on Thursdays" or "I will only use this skill against short people" and manages to abide by that rule, that particular skill will become stronger. These restrictions are called "Limitations" (制約, Seiyaku), and the act of swearing to respect them "Vow" (誓約, Seiyaku) or "Contract". The stricter the Limitation, the stronger the user's resolve, and thus the more their ability is strengthened. However, Limitations are also considered liabilities, since the power they grant is not consistent.[16]

Unlike normal conditions, which establish the general parameters of an ability, and activation requirements, which determine the circumstances in which said ability can be used, a Limitation can be broken; however, doing so not only entails the loss of the ability it was used on, but it also carries the risk of obliterating one's capacity to use Nen altogether.[16] Limitations that contain some sort of punishment (e.g. "I will die if I break this rule") will strengthen the ability even further.[16] An example is provided by Kurapika, who swore on his own life not to use an ability on anyone but the Phantom Troupe.[97] According to Izunavi, without that added risk, the ability would not have worked.[16]

Conditions

Aside from Vows and Limitations, the creator of a Hatsu ability can include conditions (条件, jōken) in it to increase its power or to make the ability feasible in the first place, whether because the user lacks the degree of skill otherwise required,[75] or because the effects of the ability exceed what can be achieved with Nen without a trade-off.[58] Much like Limitations, conditions are based on the principle of equivalent exchange, although they are seemingly weaker[124] and may occasionally be rendered redundant by high proficiency in Nen.[75] Unlike Limitations, which can be broken, albeit at a severe cost, it does not appear to be possible to violate the conditions of an ability.[125] The three categories at the bottom of the Nen chart—Conjuration, Specialization and Manipulation—are the ones that appear to rely on conditions the most.

The unconscious of the ability creator plays a fundamental role in determining the exact boundaries of a condition where those boundaries are not rendered explicit. Order Stamp works only on puppets, which are defined as “non-living objects with a discernible head”; vice versa, this means that if the puppet’s head is removed, it ceases to be counted as such and the ability terminates. Additionally, since the creator did not view human corpses as mere objects, despite them otherwise fitting the definition of puppet, Chrollo, who inherited the ability and had no such compunction, was still unable to manipulate corpses via Order Stamp, which however could be used on replicas of corpses.[22]

Activation Requirements

Many Nen abilities can be activated only after fulfilling certain conditions, which are known as activation requirements (発動条件, hatsudō jōken):[126] Shalnark and Illumi are Manipulators who need to stick a specific object into the target to be able to control them,[101][102] whereas Genthru must touch his target while uttering a keyword and then give a proper explanation of all his Hatsu abilities to activate Countdown.[127] Certain abilities have interchangeable requirements, such as Leol needing to either know the name of the ability he wants to borrow or see it in action,[128] or a photograph being a satisfying replacement for the target of Lovely Ghostwriter if they are not present in person,[105] which increases the user’s chances of success. Activation requirements may also be continuous, meaning that as soon as they are contravened, the connected ability is cancelled (e.g. a puppet controlled with Order Stamp losing its head and thus no longer qualifying as a puppet).[22]

Some activation requirements are common to many, if not all, Nen abilities with similar effects. It is well-known that not any medium can be chosen for Manipulation abilities, but that it must be an object which the user has been using for years[93] and to which they're deeply attached.[14] Likewise, it was estimated that all Nen users who steal Nen abilities and use them for themselves must meet four or five conditions before they can do so,[58] and in general their death causes the restitution of the stolen abilities.[22] An activation requirement can be so common that is given a name, as is the case for Marking (マーキング), which establishes that a teleportation ability can allow the user only to "jump" (移動(ジャンプ), transfer) to a location they had already visited in the past.[126]

Other Conditions

Additional conditions that are unrelated to paying the activation cost of an ability and which limit the range of its potential usages after also exist. The inherent impossibility of breaking such restrictions allows the user to turn them to their advantage: Shizuku’s Blinky is unable to suck in living objects and items created from aura, the latter of which she can exploit to detect traps laid with Nen.[125]

Feitan and Franklin Auction

Franklin's severed fingers

Some conditions are deeply tied to the user’s emotion, to the point of being implemented simply because they "feel right".[84][122] Notable examples are Franklin’s severing his own fingers to use his Double Machine Gun[129] and Gon’s chant while preparing a Jajanken attack, increasing risk through a long wind-up and leaving himself unprotected for a few seconds.[71]

There are also conditions that do not regulate the manner in which a Hatsu ability is to be used, but which impact the user negatively in return for use of the ability. Unlike the penalties that some Limitations contain, they are not activated when a certain rule is broken and do not impair the user’s Nen abilities, but function as a toll of sorts: an instance is Kurapika’s Emperor Time, which shortens his lifespan by one hour for each second it is active.[130]

Loopholes

Chrollo Order Stamp

Chrollo using two stolen abilities at the same time

In general, it does not appear to be possible to break a condition; however, there are Nen users who create additional abilities to bypass certain restrictions of others, so as to be capable of circumventing them under very specific circumstances. The most notable instance is Chrollo's creation of his Double Face ability, which enables him to modify the requirements of Skill Hunter that would otherwise prevent him from using more than one stolen ability at a time and from keeping both of his hands free in exchange for the addition of extra Limitations.[99] Likewise, Gon can charge two Jajanken attacks simultaneously thanks to a technique called Round 2,[7][71] although it is not clear whether it is a loophole in Jajanken or a Nen ability proper. There are also ways that exploits within the rules or abilities themselves as well as the nature of Nen itself can be used to alter abilities. For instance, while Double Face was an ability created for the purpose of bypassing restriction on keeping Bandit's Secret open to the ability page in order to use it and to use two abilities at once, Chrollo can use more than two abilities if he attaches an ability from his book that exploits Nen empowerment after death. For instance, Sun and Moon was an ability Chrollo was able to keep even though the original user died because the Hatsu became stronger after death. This meant that Sun and Moon would stay active even if the page was closed and further from that, any materialized ability like a double created by Gallery Fake would also stay active as long as Sun and Moon was still attached to that regardless of Gallery Fake's page being open.

Quantification of Aura

Enhancement and Limitations

Reinforcement Nen plays a crucial part in combat, and as such, one's affinity for said Nen category is a factor of paramount importance. For example, while a skilled Conjurer may be unable to fully block 9mm bullets with Gyo,[81] some master Enhancers can utilize Ten or Ren to resist sniper bullets without a single scratch, as well as to come out of the head-on explosion caused by an anti-tank bazooka with only minor burns.[82] When two Nen users clash, it is possible to make predictions about the outcome through a simple equation. Physical strength is represented by the acronyms AP (Attack Points) and DP (Defense Points), depending on the action of the Nen user, while the proficiency in Enhancement is expressed in SP (Spirit Points). The sum of these two factors indicates the value of one's offensive or defensive capabilities.

If an Enhancer and a Conjurer who possess equal physical strength and who have maximized Reinforcement were to clash, and the Enhancer was the one attacking, his attack power would be expressed as:

AP + SP → 100 + 100 = 200

For the Conjurer, who has the same physical strength but whose proficiency in Enhancement would not exceed 60% even if maximized, his defense power would be:

DP + SP → 100 + 60 = 160

The equation representing the action is:

(DP + SP) - (AP + SP) → (100 + 60) - (100 + 100) = -40

Thus the Conjurer would suffer 40% of the damage even if he managed to block the attack correctly. This method is a simplification, since physical strength and aura output differ from person to person, and the location, environment and moment of the attack are fundamental variables in a real fight. Nen itself is much more complicated, since its power varies depending on the user's mental state. Because of this, it is possible to use a Limitation to strengthen one's will and thus one's aura, exceeding the normal limit. If in the same instance as before the Conjurer used a Limitation worth 2 MP (Mystery Points), his defense would become:

DP + SP x MP → 100 + (60 x 2) = 220

As a consequence, the equation would be:

(DP + SP x MP) - (AP + SP) → [100 + (60 x 2)] - (100 + 100) = 20

In this case, the Conjurer would be able to block the Enhancer's attack without suffering any damage. However, due to the inherent risks of a Limitation and exceeding one's 100% limit, not all Nen users decide to resort to this method.[16]

Level, Force, and Accuracy

A Nen user's "Level" in a Hatsu type determines the abilities that Nen user can learn. It could be tentatively defined as one's degree of proficiency in a Nen type which translates in the creation of a specific ability. A Level 10 Conjurer can only master Conjuration abilities that require an amount of skill equal to or lower than Level 10. The Level of one's natural category determines the ceiling for all others, which can be calculated by applying the rule of affinity: a Level 10 Conjurer can master Transmutation abilities only up to Level 8, Enhancement and Manipulation abilities up to Level 6, and Emission abilities up to Level 4, unless he raises his Level in Conjuration by training in it[75] (or by training other types, which would cause his skills, and thus his Level, in Conjuration to increase as well).[76]

However, while said Conjurer could potentially create the same ability as a Level 4 Emitter, his effective output would pale in comparison with the Emitter's. The reason is that the law of acquisition rates applies a second time, making it so the "Accuracy" and "Force" (which have also been translated collectively as "Effectiveness" or "Power") of a Hatsu ability are proportional to the predisposition of the user for the category the Nen ability requires. As a consequence, if the Level 10 Conjurer and Level 4 Emitter from the example used the same Level 4 Emission ability, the Force and Accuracy of the Conjurer would amount to a measly 40% of the Emitter's, who has 100% affinity, and thus 100% Force and Accuracy, for that type.[75]

Aura Power

Knuckle Bine devised a way to convert aura in a numeric value, and use it in a system similar to the process of finding the Capacity factor of a power plant, in this case the power plant being the Nen user and the energy being the aura. The arbitrary unit of his system corresponds to the approximate amount of aura spent every second by a Nen user in battle mode (1 unit per second), and it is called "aura". However, once the fight starts, the aura consumption increases up to 6 or even 10 aura per second, due to the usage of techniques like Ryu and Ken and of Hatsu abilities. The less skilled the Nen user and the more powerful the technique, the more aura is consumed this way. Inexperienced users can consume as many as 10 aura per seconds with Ken, with the annexed increase when they utilize advanced techniques. After assessing how much aura his opponents spend in combat every second and for how long they can keep using it, Knuckle is able to estimate the total amount of aura they can access. He uses three parameters:

MOP

Knuckle explains his concept of MAP

  • Maximum Aura Power or M.A.P. (最大オーラ量 or MOP): the amount of aura stored inside the body of a Nen user. It varies for each individual and can be increased through training.
  • Potential Aura Power or P.A.P. (潜在オーラ量 or POP): the amount of aura that a Nen user can expend before passing out. It appears to correspond to how much of their M.A.P. a Nen user can access at a specific point in time.
AOP & Pop

AAP and PAP

  • Actual Aura Power or A.A.P. (顕在オーラ量 or AOP): the quantity of aura that is used effectively at any moment; in other words, aura output. This is what determines the efficiency of the Nen user in a combat situation, as a high P.A.P. with a low A.A.P. is meaningless. A.A.P. can be increased through training. It is also influenced by how well an individual can use Nen: lack of practice or low affinity for a certain Nen category can cause the power of an attack to be lower than the aura units expended. For example, when Gon used his Round 2 technique against Knuckle, he consumed 4000 aura to charge two abilities, Jajanken: Rock and Jajanken: Paper; however, the actual force of the Emission attack was equivalent only to 500 aura, 25% of the power of Jajanken: Rock and 12.5% of the aura consumed overall.[71]

Training Exercises

Orthodox Nen training[111] begins with meditation exercises,[131] which are aimed at allowing the student to gradually become aware of their aura flow even before their Aura Nodes are opened and to start to control it.[6] In Shingen-ryu kung fu, the Ten step in the Nen of the Flame is also utilized as a way for the student to polish their mind and thus the flow of their Ten.[15]

The first meditation exercise[131] has the aim of ascertaining the student's natural potential. The student is required to put their index fingers slightly apart, and have the tips close in on each other until they have the sensation of pushing against something. The farther apart the fingertips are when the student begins to feel the presence of aura, the greater their predisposition.[81] What follows are the basics of aura manipulation, even if the student is still incapable of seeing aura. In the first and only known exercise of this phase, the student is to place their hands in front of their chest and imagine forming a ball between them. This exercise is meant to develop the student's ability to feel their own aura. In general, it is performed for 10 days, with 3 sets of 10 minutes every day; particularly talented individuals can begin to sense their aura in 5 to 7 days, although in extremely rare cases some may succeed on the first try.[111]

Students generally learn to open the Aura Nodes in their eyes, thus obtaining the ability to see aura, in about one year,[117] although gifted individuals can grasp the basics of Nen in six months.[11] Once all of the student's nodes are opened, which normally occurs after one year of three hours of basic exercises every day,[12] they are introduced to the first principle, Ten,[15] learning to contain the leaking aura little by little through breathing exercises.[12] Next is Ren, which in turn leads to Gyo and other techniques.[15] Hatsu is first trained through the Water Divination exercise, by having the student attempt to produce a more pronounced change.[3]

Mastering Ten in six months is indicative of uncommon talent.[6] Regardless of their level, it is advised Nen practitioners train their Ten and Ren daily,[48] since they are the foundations of all advanced techniques.[15]

Biscuit's Training

Biscuit has devised exercises to train her students in every aspect of Nen after they master the basic techniques enough to pass the secret Hunter Exam. She models her coaching method on her students to best suit their needs, often giving them very precise instructions but also letting them reach the answer on their own from time to time. Unlike her former pupil Wing, she has her students train their guard and physical, combat and analytical abilities together with Nen. By her own admission, her regimen is much harder than his.[132]

Gyo Training

The first exercise she has her students perform requires them to rapidly activate Gyo on their eyes and tell her what number she is forming with her In-concealed aura whenever she raises her index finger. Should she have more than one student, she makes them compete amongst each other, and the slower one to respond is penalized with physical exercises.[133] Should all her students be too slow, all of them will be punished.[61] There is no set time for this exercise, and in fact it is used to teach students to remain constantly vigilant and activate Gyo at the slightest hint of danger, until it becomes second nature to them.[133]

Shu Training

On Greed Island, Biscuit had Gon and Killua dig through rock formations using regular shovels, confiding that they'd be able to figure out the existence of the technique and how to utilize it all on their own.[61]

Ken Training

After explaining how to perform Ken, Biscuit proceeds to demonstrate Ko and demands that her students maintain Ken for at least thirty minutes, during which she holds Ko as if about to strike.[60] Once they manage to hold the technique for that long, she hits them with a slow-moving Ko punch to test their resistance.[72]

Ryu Training

When a student manages to hold Ken for at least 30 minutes, they are ready to learn Ryu. Biscuit instructs them on which proportions of their aura to focus on which body part for 30 minutes, three times a day. At the same time, her student are introduced to the kumite section of her program, in which they spar using Ryu, so as to learn how to adjust their aura flow while attacking and defending.[72]

Ko Training

Biscuit's exercises or Ko training were not shown, but it appears the technique is taught at some point after the Ken exercises[60] and before the Hatsu ones, as the first of the latter requires the use of Ko.[59]

Hatsu Training

See also: Biscuit's Hatsu Training

These exercises are structured in levels, and the student can generally progress to the next after achieving a certain degree of mastery over a lower one. Her students train in all accessible Nen types, as, on top of granting them more flexibility, this allows them to progress in their own category more quickly.[76] Her fundamental rule is that only one Nen category can be trained a day.[59] Students normally focus on their natural category every other day, while in the other Nen types are rotated and more are added as the student progresses.[84] When coaching Gon and Killua, Biscuit introduced them to Enhancement first,[59] and seemingly saved Manipulation for last.[84]

  • Biscuit's smashing a rock
  • Nen number
  • Aura throwing
  • Aura levitation

Enhancement Training

  • Level 1 - Rock Breaking

The student enhances a stone's durability using Shu and Ko to repeatedly smash other rocks without breaking the one they are holding. The exercise terminates either when a student manages to break 1000 rocks in a day, in which case they are ready for the next level, or when the stone they are holding shatters. On top of the aura consumption, the repetitive movement puts stress on the student's focus, causing their aura control to become less and less precise. Only one try a day is allowed.[59]

Transmutation Training

  • Level 1 - Shape-shifting

The student must form the numbers 0 through 9 on top of their finger by manipulating the shape of their aura, much like Biscuit does to train their Gyo, while also running. The student can proceed to the next level once they manage to form the 10 numbers in one minute, with the end goal being 5 seconds.[84]

Emission Training

  • Level 1 - Name Unknown

This exercise is comprised of two parts. In the first, the student must form a small bubble out of their aura from the tip of their finger and maintain it in place for one minute. Once they manage to do so, they have to attempt to throw it over a certain distance without the bubble dissipating. The time the aura bubble can be maintained afloat reflects the strength of one's Ten. Effort is also required to maintain the shape of the bubble.[49]

  • Level 5 - Floating Hand[134]

The student positions into a one arm handstand, then they project their aura outwards explosively from the hand that is touching the ground so as to propel themselves into the air. The student can proceed to the next level once they manage to launch themselves a few dozen centimeters; otherwise, they keep practicing for as long as they can maintain the handstand. A student who has mastered this level is able to knock an opponent back a dozen feet with an Emission attack.[134]

Ren Training

Very similar to the basics of Ken training, this step of Biscuit's regimen is intended to increase the student's aura pool, in particular to allow them to maintain Ken for longer in combat. In order to accelerate progress, she can speed up the student's recovery with her Hatsu ability.[53] Once the student manages to maintain Ren for three hours, they will still have to hold it for that amount of time once a day. Biscuit also had Gon and Killua fight Knuckle right after the end of the exercise.[43]

Kurapika's Training

According to Kurapika, the way a person feels most comfortable clasping their hands together can hold information about the best way to introduce them to the basics of Nen. There are at three groups:

  • Those who touch their palms together and interlock their fingers as if in prayer are called "prayers". The first exercise for them is to imagine scooping up water with their eyes closed.
  • Those who grasp their hands like during a handshake are named "shakers". The first exercise requires them to hold hands in a circle and to imagine their aura flowing clockwise.
  • Those who grasp their wrist are called "catchers". The first exercise requires them to spin their hands in a circle as if to make cotton candy.[135]

With this method it is possible to learn to generate enough aura to perform the Water Divination test after only one week of training.[107]

Izunavi's Conjuration Training

The first step for a Conjurer to develop a Nen ability is to decide what object they want to materialize. Then, they must undergo intense imagery training by being in contact with said object every waking moment, studying them with all five senses and drawing pictures of them. When the student begins to dream about the intended object every time, the teacher takes it away from them. The dreams are subsequently replaced by hallucinations, which get more and more real to the point they also involve the senses of touch and hearing, until the Conjurer unwittingly materializes one.[48]

Trivia

  • In the manga, six characters have used Nen before it was explained to Gon and Killua: Gon,[14] Illumi[136][137][138] (Hunter Exam arc), Zebro[139] (Zoldyck Family arc), Zushi, Wing,[140][13] and Hisoka[1] (Heaven's Arena arc).
  • Kurapika is the only character who falls under two different Nen categories.
  • Manipulation is the only category of Nen that none of the protagonists fall under.
  • Aura can be filmed,[15][55] but it will still remain invisible to those who cannot use Nen.[141]
  • Curiously, despite sound having very different physical properties from light and thus hearing differing from sight, non-users are unable to hear sounds made by Nen constructs.[2][103]
  • Despite Izunavi stating the position of Specialization in the Nen chart is due to the fact that Conjurers and Manipulators have the highest chance of becoming Specialists later in life,[16] it has been shown multiple times that the presence of this Nen type affects all others: for example, Conjurers have 60% affinity for Manipulation instead of 80% because Specialization is located between the two in the chart.[16][75]
  • According to Hisoka, Enhancers and Transmuters have opposite personalities, and they might be attracted to each other because of it. There are several instances of this happening in the series:
    • Gon and Killua: They are best friends.
    • Gon and Hisoka: Hisoka is attracted to and fond of Gon, and has aided (or refrained from harming and/or killing) him on numerous occasions, although the interest is not reciprocated.
    • Phinks Magcub and Feitan Portor.
    • Netero and Zeno: According to the latter, they are like "Yang" and "Yin" respectively.
    • It is interesting to note that there is some enmity between Transmuters and Enhancers in the series. For example, the Enhancers Uvogin, Phinks, and Nobunaga didn't get along well with Hisoka, a Transmuter.
  • While using Ken, Gon's aura output during his final fight against Knuckle was about 1800 aura units, and a punch thrown in that state 150 aura units.[71] This might mean that on average, a Ken punch contains 1/12th of the user's total aura output.
    • A similar calculation may be used to determine a relation between aura output and aura reserves. If Gon's M.A.P. (21,500 aura units) is divided by his output (1800 aura units), the result is approximately 12. However, output is a factor that can vary with training,[71] and Gon's has always been considered exceptional.[142] Furthermore, it used to fluctuate with his emotions.[143] All of this suggests that his values may not be reliable to establish a general law.
  • The terms used for "Vows" and "Limitations" are homophones in Japanese (せいやく, Seiyaku).
  • In Japanese, the acronyms MAP, PAP, and AAP were written as MOP, POP, and AOP due to the katakana transcription of "Aura", which is "オーラ", or, in rōmaji, "Ōra". To preserve the original acronym, Viz excluded "Aura" from them in the translation, with the "O" standing for "Output".
    • Furthermore, the "P" in all three acronyms stands for "Power", but the kanji "量" actually means "volume".

Anime and Manga Differences

Nen equation

The equation according to the anime

  • In the 2011 anime, the equation representing the power of Limitations is different from its counterpart in the manga, with Mystery Points affecting both Attack Points and Spirit Points:
(AP + SP) x MP = ?

Miscellaneous

  • Aura is translated as "Chi" (氣) in the Chinese edition of Hunter × Hunter. Chi is known as "Ki" (気) in Japanese.

Translations around the World

Language Name
The Arab world Flag Arabic نين (Nayn)
China Flag Chinese 念能力 (Niàn Nénglì)
Russia Flag Russian Нэн (Nen)

References

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  143. Hunter × Hunter - Volume 20, Chapter 207

Start a Discussion Discussions about Nen

  • Anyone tried making up their own Nen powers? :D

    14 messages
    • Oui oui! Le Paris como es baguette!
    • Pigzillion wrote: Oui oui! Le Paris como es baguette! Exactement!!!
  • nen beasts

    3 messages
    • "Nen beasts" is a specific term which does not refer to any animal created with aura. In fact, many (if not all) of them are emitted,...
    • The indoor fish of Chrollo, the abengane's exorcism thats transform nen into a monster-like creature. Theres other examples of nen beasts ...