Destoroyah (Dawn of the Godzilla Universe)

Destoroyah is an Oxygen Destroyer-mutated prehistoric crustacean kaiju created by Toho and appears as a major antagonist of The Dawn of Godzilla, serving as the main antagonist of the third and final season. He is the spawn of the Oxygen Destroyer and Godzilla's most powerful foe.

Origin
Destoroyah is a colony of prehistoric crustaceans mutated by the Oxygen Destroyer.