Why is Kurapika so powerful?


I know he made ​​a contract with his own soul or something like that. But if
this Nen is so powerful, how come he is the only who used it in the series?

I also watched the previous version(1999), and there was no one who did this
type of contract besides him.




Kurapika's scarlet eyes allow him to shift from becoming a Conjurer to a
Specialist because of their unique nature. This ability, Emperor Time, allows
him to utilize all the types of Nen to 100% efficiency.

Kurapika has a Nen blade chain wrapped around his heart. Kurapika imposed a
limitation onto this chain, it can only be used to deal with members of the
Phantom Troupe. If this condition is violated, Kurapika will die. This
condition (a
[Limitation](http://hunterxhunter.wikia.com/wiki/Nen#Vows_.26_Limitations), a
Vow with a punishment) was needed in order to increase the strength of the
ability.




Kurapika's scarlet eyes allow him to shift from becoming a Conjurer to a
Specialist because of their unique nature. This ability, Emperor Time, allows
him to utilize all the types of Nen to 100% efficiency.

Kurapika has a Nen blade chain wrapped around his heart. Kurapika imposed a
limitation onto this chain, it can only be used to deal with members of the
Phantom Troupe. If this condition is violated, Kurapika will die. This
condition (a
[Limitation](http://hunterxhunter.wikia.com/wiki/Nen#Vows_.26_Limitations), a
Vow with a punishment) was needed in order to increase the strength of the
ability.

