Aerugo is a water monster from Hyrule what looks like a snake.
Aerugo was imprisoned in a chamber filled with steam long ago. He had destroyed many villages and threatened the safety of the country. He now broke free of his fiery cell and is destroying Hyrule. The group of heroes had to travel to an alternate dimension called "Steampunk Hyrule" by the group. There, they had to find the three Steam Cores to destroy the monster for good.