Shu

Shu (周, Shu) is an advance Nen technique.

Description
Shu (周, Enfold) is an advanced application of Ten. Shu allows a user of Nen to extend their aura's envelopment onto an object, allowing them to use that object as if it were an extension of their own body. For example, one could use Shu to extend their Ten around an object, which would strengthen and protect the object like the way Ren strengthens and protects their body. This is the technique that allows Hisoka to make his solitaire cards as sharp and as hard as metal knives.