Asag

In the Sumerian mythological poem Lugale, Asag is a monstrous demon. He is described as being so hideous that his presence makes fish boil alive in the rivers. He was said to be accompanied into battle by an army of rock demon offspring - born of his union with the mountains themselves. He was defeated by the god Ninurta.

Asag, whose name means "demon that causes sickness", was often associated with the serpent or dragon mythological archetype by historians.