Crast

The Kanohi Crast was the Mask of Repulsion. It repelled whatever the user wanted, including nature itself. By repelling the ground, the user could fly.

Great

 * Makuta Krika - Formerly wore shapeshifted version; now deceased.

Trivia

 * Toa considered this power to be immoral, since the Crast repelled nature itself.
 * The Crast was designed by Bionicle part designer Erland Refling Nielsen.