"Krika triggered his mask power. The Kanohi Crast, or Mask of Repulsion, sent Gorast hurtling away from him at high speed. She smashed into a nearby stalactite with a sickening thud and hit the mud, dazed."
The KanohiCrast was the Mask of Repulsion. It gave its user the power to repel whatever they wanted for offense or defense. By repelling the ground, the user could achive a limited type of flight. The user can only affect one target at a time, and can control how hard they repulse the target.