Akaku

The Kanohi Akaku was the Great Mask of X-Ray Vison. The Great Akaku allowed its user to see thermographically and through solid walls. The Akaku Nuva allowed the user to share this power with others.

Tahu, Gali, Onua, Pohatu, and Lewa all found Great Akaku masks as well, but lost them when they became Toa Nuva.

Kanoka disks made from

 * Regeneration
 * Teleport

Nuva
it could possibly be made from the Ko-Metru disk

Known Wearers

 * Kopaka (Great and Nuva level)
 * Pelagia (Great but powerless)
 * Bour (Great but powerless)
 * Aft (Great but powerless)
 * Matoro (Great but powerless, replaced with Iden upon arriving in Karzahni)
 * Gali (Great, used when observing the red star)