Akaku

The Kanohi Akaku is the Great Mask of X-Ray Vison. The Great Akaku allows its user to see thermographically and through solid walls. The Akaku Nuva allows the user to share this powers 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 can possibly be made from the Ko-Metru disk

Known Wearers

 * Kopaka (Great, lost when he became a Toa Nuva)
 * 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 red star.