Rau

The Kanohi Rau was the Mask of Translation, a Kanohi that enables its bearer to understand any written or spoken language known to the Great Beings. While the Rau is most-often used to establish communication between Rahi and Matoran, it is also capable of translating Skakdi and Agori. The mask, however, proved tremendously impractical

History
The Kanohi Rau traces its origins back back to some of the earliest mask-making techniques adopted on Spherus Magna, where an unclear number of Rau masks were created for the Matoran populace. At this point in the history of the Matoran Universe, the Rau became heavily associated with Ga-Matoran, who held the mask up as a symbol of their elemental discipline.

Over the 100,000 year span of the Matoran Universe's functionality, the Rau became a particularly wide-spread Kanohi. Favored in particular by Toa of Water, the Rau was also know to be sought after by Toa of Earth and Turaga for the purpose of translating ancient texts or communicating with Rahi.

In Metru Nui, a Rau could crafted with relative efficiency using Remove Poison and Enlarge Kanoka disks. Given the ease with which Rau could be created, however, the Kanohi became somewhat common in wider Matoran society, often sold for cheaper prices.

Quite notably, a Ga-Matoran named Nokama was known to have sported a Rau during her time as a Toa Metru, one of the Matoran Universe's final and most prominent Toa Teams, marking a decisive footnote in the mask's history.

Great

 * Nokama - Transformed into Noble

Powerless

 * Ahkmou
 * Dalu