 This is the "fate of the gods" - Ragnarök.She describes the summons to battle, the deaths of many of the gods and how Odin, himself, is slain by Fenrir, the great wolf.Thor, the god of thunder and sworn protector of the earth, faces Jörmungandr, the world serpent, and wins but Thor is only able to take nine steps afterward before collapsing due to the serpent's venom.