The various mask powers could be activated individually or simultaneously by the user. An Aki could be formed by merging a Hau, Pakari, and Kakama together. The Aki appeared as a Great golden-colored Hau. If an Aki were taken off of its Toa Kaita, it would exist as long as the Kaita existed. Only Toa Kaita could form Great Aki. However, it was not possible to create a Noble Aki.