Iden

The Kanohi Iden was the Mask of Spirit. It allowed the user to leave their physical body and become a ghost-like figure. When in their "spirit form," the user was intangible and invisible, and their physical body went limp. When in their spirit form, a being could fly at great speeds. The only beings who could see a being in their spirit form was a wearer of an Elda or a Rode, and the spirit could only communicate with beings wearing one of those masks.

When a being was in this spirit form, their body was vulnerable, being that they now had no way to protect their physical body. In Toa Inika Matoro's case, the other Inika would protect his body from harm until he returned.

Also, in spirit form, a being could not do anything to affect the outside world, not even use their elemental powers, as that required a union of the mind and body.

Bearers

 * Toa Inika Matoro (received in Karzahni and lost after becoming a Toa Mahri)