Brontes the Thunderer

Brontes the Thunderer was the name given to one of the Cyclopes, one-eyed hybrid beasts created by the Isu as part of their Olympos Project. The creature was held in a vault below the Isle of Thisvi, where it remained until its defeat and death at the hands of the misthios Kassandra during the 5th century BCE.
After Kassandra defeated the Cyclops and removed the Atlantis artifact from its body, Brontes' transformation was undone, leaving only the desiccated corpse of a human.