User blog comment:Prince of Erebor/Weakest Nen ability/@comment-4753851-20151017182323

If you think about it Chrollo Lucifer's ability is weak. Or rather his ability is only useful against the weak. It is almost too limited to be of use against strong opponents from what we've seen so far. In order for him to use his ability the book must remain open in his hand. So right then and there he is down to using one hand for offense and defense. And if he summons an ability like the Owl's cloak then his other hand is occupied as well. Granted that ability is useful against weaker opponents but not stronger ones. Also, if the original owner of the stolen ability dies than Chrollo can no longer use that ability. So while he has multiple useful abilities, he can only use one at a time, at anytime he could lose one, and the effectiveness could be limited because he can only use one hand to use the ability.