The cosmos was supported by a tremendous ash tree, Yggdrasil. One of its roots extended to Niflheim, which was the netherworid; another to Jötunheim, the dwelling place of Giants; another to Midgard, the home of man; and one to Asgard, the home of the gods. In its upper branches lived a squirrel and an eagle, while at its rootage lived the serpent Nidhögg, which gnawed away, until at the end of time the whole structure would collapse. In the meantime the Norns, or Fates, watered the tree to keep it from dying.
Odin knew the power of the gods was not eternal, for he and his comrades would die when the Giants and demons rose against them. The last fight would take place at Vigrid, a field one hundred miles in length and breadth. Odin would be swallowed by Fenrir the wolf, but his son would avenge him. Thor and the Midgard Serpent would destroy each other; so would Loki and Heimdall; and Tyr would slay Garm, the fierce dog of Niflheim, and be clawed to death in turn. The stars and all heavenly bodies would plummet from the sky as the earth sank beneath the sea. The twilight of the gods would become night, and the universe would exist no more.
Yet there still existed a power, the Nameless One, that would give birth to a new world beyond the edge of time.
