Ken

Ken (堅, Ken) is an advance Nen technique.

Description
Ken (堅, Fortify) is the advanced version of the basic Ren technique. Ken is a defensive technique where a Nen-user maintains a state of Ren over their entire body, allowing them to defend against attacks from any direction without the need to use Gyo. Ken is as useful as a defensive position, but is tiring to maintain. Additionally, it is not as strong as Gyo on any given part of the body, since it protects the whole body evenly. Because of that, it is used to guard when one wants to be cautious.