In Norse mythology, the god Týr loses his hand when Fenrir is bound.
The gods need to restrain Fenrir because they fear the wolf’s growing power. Fenrir agrees to test the magical binding Gleipnir only if one of the gods places a hand in his mouth as a guarantee that the gods will release him if the binding proves unbreakable.
Týr accepts the risk. When Fenrir discovers that Gleipnir cannot be broken and the gods refuse to free him, he bites down and severs Týr’s right hand. The injury becomes one of Týr’s defining mythological features and explains his later association with courage, oaths, and law.
Týr is sometimes incorrectly identified as the god who kills Fenrir. In the Ragnarök tradition, Fenrir kills Odin, and Odin’s son Víðarr later avenges him by killing the wolf.