"The Toa of Air triggered the power of Mask of Illusion, transforming himself into a duplicate of a Vahki Rorzakh. [...] Once the shapeshifting was done, he stepped boldly out to face the oncoming order enforcers."
The Mahiki was the Mask of Illusion. The Great Mahiki gave its user the power to shapeshift, but did not let them copy the powers of the being they transformed into. The Noble Mahiki did not allow the user to shapeshift, but only let them project illusions. Elda, Arthron and Rode could see through the usage of a Mahiki.
Mahiki were carved out of a mixture of Reconstitute At Random and WeakenKanoka on Metru Nui.