Ignika

The Kanohi Ignika is the Legendary Mask of Life. The Great Beings created the living mask as a failsafe to restore the Great Spirit's health in times of need. If the Matoran Universe was beyond saving, however, the Ignika would kill all of its inhabitants.

When the Great Spirit Mata Nui was killed by Teridax, the Toa Mahri used the Ignika to revive him. Inspired by the selfless sacrifice of Toa Mahri Matoro, who died upon donning the mask, the Ignika created its own body from plant material and dubbed itself Toa Ignika. The "Toa" aided the Toa Nuva in their mission to reawaken Mata Nui, who after Matoro's sacrifice was alive yet comatose. Ultimately Toa Ignika sacrificed his body to provide the energy necessary to reawaken Mata Nui.

However, while Mata Nui was incapacitated Teridax assumed control of the Matoran Universe, trapped Mata Nui's spirit in the Ignika, and cast the mask out into the cosmos. It landed on Bara Magna, where it created a body for Mata Nui. Using this body, Mata Nui participated in the Skrall War. Mata Nui later transferred his spirit from the Ignika to a prototype Great Spirit robot to duel Teridax. Upon victory Mata Nui's spirit returned to the Ignika once more, where he has chosen to remain.