User blog:MrGenial11/Gon's transformation in The Last Mission revealed

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Reminder :

"On" 怒 念能力の対極にあり、怒りや憎悪を源とする力. 念よりも強大な力を得ることができるが、とても厳しい“制約と誓約”を結ばなければいけないため、命を落とす者が後を絶たなかった. はるか昔に封印された禁断の能力.

Is the extreme opposite of Nen, based of hatred, is a lot more powerful than Nen but there are strict conditions and restrictions to be able to use it It can only be obtained with a strong sense of revenge, and once that revenge is accomplished the user cannot escape death. It's a power that has been sealed in the past.