Fenrir

The Wolf That Ends the Gods

Fenrir is the monstrous wolf of Norse myth, a son of Loki who grew so vast and fearsome that the gods resolved to bind him. He broke every fetter until the dwarves forged Gleipnir, a ribbon spun from impossible things; suspecting a trick, Fenrir agreed to be bound only if a god placed a hand in his jaws as pledge, and Tyr lost his hand when the wolf could not break free. At Ragnarok he will slip his bonds, devour the sun, and slay Odin himself before being killed in turn.