Hunter x Hunter: Double Machine Gun

The fingers and thumbs on his two hands become openings similar to those of shotguns, and through which he can expel aura balls to attack. He could also throw his balls without using the openings of his fingers, but because it's much more impressive, he cuts his own fingers. In actuality, it allowed his aura to become stronger, in fact, determination and self-imposed limitations play a very important role in the progess of the power of the nen.