“Kopaka stepped away from Pohatu and activated the power of his mask, enabling him to peer through tons of stones into the network of caves within Mount Ihu. It was the work of moments to find a cavern in which there was a lone KanohiHau Nuva, the Mask of Shielding.”
The Akaku Nuva was the Kanohi NuvaMask of X-Ray Vision, created when a destined KanohiAkaku was dipped in Energized Protodermis and transformed. The Akaku Nuva gave its user and those nearby the power to see through solid objects and illusions. Akaku Nuva were fitted with telescopic lens to give the user(s) enhanced viewing. For some reason, this mask's power could not pierce the mist in Karda Nui or the domes of the Matoran Universe. The only beings able to activate this mask's power were Toa Nuva.
Akaku Nuva: The Great Mask of X-Ray Vision--Allows the user and those close by to see through walls and discover that which is concealed by physical means or illusion.
A white Akaku Nuva was released in 2002 as part of the Kopaka Nuva canister set. The Akaku Nuva was also released in red, blue, green, brown, and black as part of the Mask Packs, representing the Kanohi Nuva collected by the other Toa Nuva. It also came in a pearl silver version to indicate the depowered form of Kopaka Nuva.
A white Akaku Nuva was released in 2008 with the Kopaka Nuva Phantoka set to represent the sky-adapted form his mask and armor assumed.
When Kopaka's Akaku Nuva changed into a sky-adapted form, its telescopic lens shifted to the left eye, as opposed to its usual right side.