What monstrous wolf is prophesied to kill Odin during Ragnarök?

Fenrir is the monstrous wolf, son of Loki and the giantess Angrboða, fated to kill Odin during Ragnarök. The gods tried to prevent this by binding him with the magic ribbon Gleipnir—costing Týr his hand—but at the world’s end Fenrir breaks free and devours the All-Father. Odin’s son Víðarr then avenges him. To avoid confusion: Garmr is the hell-hound of Hel’s realm, Sköll is the wolf who chases the sun, and Hela (Hel) rules the dead—none kill Odin. Memory tip: “FENrir FINishes the Father.”