Fenrir
The gods challenged Fenrir to break this chain as well. The wolf saw how thin and well made Gleipnir was and thought it was a trick. He agreed to try and break the chain, but only if one of the gods would put his hand in the wolf's mouth. He believed this would force them to free him if he could not break the chain. Only Týr was willing to put his hand in the wolf's mouth. Fenrir tried to break the chain. The more he tried, the tighter the chain held him. When the gods would not free him, the wolf bit off Týr's hand at the wrist.