Fenrir

From Old Norse fen meaning "marsh, fen". In Norse mythology Fenrir was a ferocious wolf, one of the offspring of Loki and the giantess Angrboða. Because it was foretold he would bring about disaster, the gods bound him with a magical fetter, though in the process Tyr's hand was bitten off. At the time of Ragnarök, the end of the world, it is told that he will break free and kill Odin.