Zetsu

Zetsu (絕, Zetsu) is one of the four basic Four Major Principles of the Shingen-Ryu school of Kung-fu Nen techniques.

Description
While Ten allows a user to keep aura from leaking away from their body, Zetsu (絕, Suppress; Null) stops the flow of aura from their body altogether. By closing all of their aura nodes, the user is able to stop almost all outflow of their aura like water from a valve. Since the user is no longer surrounded by their own aura, they are more sensitive to the aura of others. This can be useful when tracking another person and it will also prevent other users of Nen from noticing them because of the user's presence is nearly erased. Zetsu can also be used to relieve fatigue, since it forces the body's external layer of aura to be fully contained within.

However, since Zetsu involves shutting off one's aura, it can be dangerous due to it leaving the body defenseless against any aura attack. Even a weak attack enhanced with Nen could do massive damage.