Kohrak-Kal was one of the six Bohrok-Kal. Its tool was the sonic shield, which could create a sound barrier that could repel most forms of attack or cause objects to vibrate until they shattered.1
Notes
Kohrak-Kal's color was silver, and its power was sonics. Its sonic shield could form a barrier of solid sound, make objects stress and shatter, or create solid objects made of sound. Kohrak-Kal was often seen on its own because its powers were so great that they could affect even the other Bohrok-Kal. It was the easiest of the Bohrok-Kal to track, since the use of its powers created sonic booms.2