In

In (隱, In) is an advance Nen techniques.

Description
In (隱, Conceal) is an advanced form of Zetsu used to almost completely conceal the presence of a Nen-user's aura. In can be used on a Nen-user's Hatsu ability to make it invisible to other Nen-users. In can be countered by using Gyo in the eyes or through En.