Gau

The Kanohi Gau is the Great Mask of Reinforcement. It gives its' user the powers of Sonar, Gravity, and Stealth. The powers could be activated simultaneously or separately.

Great
The Gau is theoretically worn by the Toa Mahri Kaita Hewkaruja, but he has never been formed. Thus, it is believed than a Gau has likely never existed in the Matoran Universe.

Trivia

 * This mask was created by BZPower and C.I.R.C.L.E. member Toa_Ausar.
 * This mask manifests in the shape of a silver Great Kanohi Arthron.