Amatera

Amatera is one of the six gods and is widely considered the most powerful, having caused the Great Cataclysm when They grew displeased with humanity. It is primarily the God of the sun, but also represents fire and heat, hence its namesake of Amatera Mountain.

The Great Cataclysm
Around 1500 years prior to the story, Amatera became displeased with humanity and in Their wrath, brought the eruption of Amatera Mountain. Had it not been for the sacrifice for Rota, the dragon God, the People of Archaia would have been wiped out and the world destroyed.