Once Hydraxon was defeated in the quest for the mask of life, he wandered. Hydraxon traveled for years until his travels brought him to the abysmal seascape where Matoro and Maxilo final battle took place. Still remaining particles in the atmosphere altered hydraxon into a powerful being, Hydraxis. Hydraxis left his underwater world to become a tyrannical leader of a group of head hunters. Hydraxis`s new goal is to find toa Vahi and claim his mask for himself.