Akaku

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

 * Weaken
 * Teleport

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)