The Kanohi Crast was the Mask of Repulsion, worn by Makuta Krika. This mask could repel anything Krika chose, even the ground, which allowed him to fly.[1]
Notes
Krika's Kanohi Crast, the Mask of Repulsion, allowed him to hurl anything away from himself at high speed.[2]
It was not one-of-a-kind.[3]