A storm demon from Iranian mythology. He steals cattle and brings harm to humans. It is a snake-like monster with three heads and six eyes who also personifies the Babylonian oppression of Iran. The monster will be captured by the warrior god Thraetaona and placed on the mountain top Dermawend. In a final revival of evil, it will escape its prison, but at the end of time (fraso-kereti) it will die in the river of fire Ayohsust.