A great and terrible monster in the form of a wolf, Fenrir is the eldest child of Loki and the Angrboda, the Giantess. A prophecy warned the Aesir that the wolf and his family would one day bring about the destruction of the world. Fenrir was caged, and only Tyr, the boldest of the Gods, dared to feed and take care of the wolf.
Fenrir was bound with Gleipnir, a magic ribbon that was incredibly strong, and while bound had a series of diplomatic exchanges with the Gods, and eventually bit off the hand of Tyr. Fenrir was then kept a mile below the surface of the Earth with a sword in his mouth.
It is said on the day of Ragnarok, the last battle, that Fenrir will break his chains and join the Giants in their battle against the Gods. He will seek out and devour Odin, and then, in turn, be killed by Odin’s son, Vidar.