also found a shorter version:
Fenrir.
Fenrir was a gigantic and terrible monster who favoured the shape of wolf greater in size than any man. He was the eldest child of the malevolent god Loki and the giantess Angerboda.
Prophecy stated that the wolf and his family would one day be responsible for the destruction of the world, so while he was still a pup, the gods caught the wolf and locked him in a cage. However as he grew greater no cage could hold him, and no matter how hard the gods tried to chain him, he always broke loose.
In desperation the gods ordered the dwarves to make a chain strong enough to hold the wolf. The result was a deceivingly thin ribbon of graet strength: Gleipnir - fashioned from the footstep of a cat, the roots of a mountain, a woman's beard, the breath of fishes, the sinews of a bear, and a bird's spittle.
Fenrir however, saw how thin the chain was, and said that was no pride in breaking such a weak chain. Eventually, though, he agreed, thinking that otherwise his strength and courage would be doubted. Suspecting treachery however, he in turn asked the gods for a token of good will: one of them had to put a hand between his jaws. The gods were not overly eager to do this, knowing what they could expect. Finally, only the god Tyr agreed, and the gods chained the wolf with Gleipnir. No matter how hard Fenrir struggled, he could not break free from the ribbon, and so he was bound; but during the struggle, Fenrir bit off Tyr's hand. The gods carried Fenrir off and chained him to a rock a mile down into the earth. They put a sword between his jaws to prevent him from biting.
On the day of Ragnarok, Fenrir will break his chains and join the giants in their battle against the gods. He will seek out Odin and devour him. Vidar, Odin's son, will avenge his father by killing the wolf.
