Fenrisulven

Fenrir (Old Norse: Fenrisúlfr) is the son of Loki and the giantess Angrboða. He was raised in Asgard but grew so large and dangerous that the gods resolved to bind him. Two iron chains shattered like thread. The dwarves then forged Gleipnir from six impossible things: the sound of a cat's footstep, the beard of a woman, the roots of a mountain, the sinews of a bear, the breath of a fish, and the spittle of a bird. Gleipnir looks like a silken ribbon but cannot be broken. When the gods sought to bind Fenrir, he demanded that one god place a hand in his jaws as a pledge. Only Tyr was willing — and lost his hand when the wolf felt himself tricked. At Ragnarök Fenrir breaks free, swallows Odin, and is then slain by Odin's son Vidar.