Ruru

"Whenua nodded and concentrated as never before. His Mask of Power glowed as brightly as a sun, its light piercing the ground. Suddenly, he was able to see through solid matter, his vision extending down into a storage hold far beneath the Coliseum."

- Narration, BIONICLE Adventures 4: Legends of Metru Nui

The Kanohi Ruru was the Mask of Night Vision. The Great Ruru gave its user the power to see clearly in darkness and a limited amount of x-ray vision. It also let them cast a beam of light for illumination, which could be used to blind opponents. The Noble Ruru only allowed its user to see clearly in darkness.

Ruru were carved out of a mixture of Teleport and Enlarge Kanoka on Metru Nui.

Example Usage

 * Great: In BIONICLE 2: Legends of Metru Nui, Toa Whenua used his Ruru to light up a cave that Lhikan, Onewa, Nuju, and himself walked through. He later used his Ruru to see through the floor of the Coliseum.
 * Noble: In BIONICLE Chronicles 4: Tales of the Masks, Turaga Whenua used his Noble Ruru to watch two Manas fight each other.

Great

 * Toa Metru Whenua - Formerly; briefly lost when he became a Toa Hordika; transformed into its Noble version when he became a Turaga.

Noble
*Turaga Vakama - Formerly secondary mask; destroyed with Ta-Koro.
 * Turaga Nokama - Secondary mask
 * Turaga Whenua - Primary mask
 * Turaga Matau - Secondary mask
 * Turaga Onewa - Secondary mask
 * Turaga Nuju - Secondary mask
 * The Toa Mata - Formerly secondary masks, lost when they became Toa Nuva.

Ruru

Powerless

 * Matoran Whenua - Formerly; transformed into its Great version when he became a Toa Metru.
 * Umbra
 * Garan
 * Idris
 * Aiyetoro
 * Ally
 * Hafu
 * Jaa
 * Kailani
 * Kapura
 * Kongu - Formerly on Metru Nui; replaced with a Miru on Mata Nui.
 * Nuhrii - Formerly on Metru Nui; replaced with a Kaukau on Mata Nui.
 * Taipu
 * Tiribomba
 * Tuuli
 * An infected Po-Matoran - Formerly; since uninfected.