"Pohatu lost track of how far they walked. He was beginning to wonder if they would be able to find their way out again, then reminded himself that Kopaka's Mask of X-Ray Vision would show them the way."
— Narrator, Tales of the Masks
||Kanohi Nuva of X-Ray Vision
||Enhanced X-Ray Vision
||The Toa Nuva
The view through an Akaku Nuva's eyepiece as shown in Mask of Light
The Akaku Nuva is the Kanohi Nuva Mask of X-Ray Vision, created when a destined Kanohi Akaku is dipped in Energized Protodermis. It allows its user and those nearby to see through objects and illusions. They are fitted with a telescopic lens to give the user(s) enhanced viewing. For some reason, this mask's power cannot pierce certain materials, such as Karda Nui's mist and the Metru Nui dome. The only beings able to use this mask are Toa Nuva.
Kopaka used his Akaku Nuva to give himself, Tahu, and Gali X-ray vision to examine their surroundings for traps during one of their quests for the Kanohi Nuva in Tales of the Masks.
- Toa Nuva Tahu - Former secondary mask; destroyed during the sinking of Ta-Koro
- Toa Nuva Gali - Secondary mask
- Toa Nuva Lewa - Secondary mask
- Toa Nuva Pohatu - Secondary mask
- Toa Nuva Onua - Secondary mask
- Toa Nuva Kopaka - Primary mask
||A normal Akaku Nuva
||An Akaku Nuva, adjusted for an aerial environment via the Adaptive Armor.