Fenrir (also known as Fenrisúlfr) was a monstrous wolf in Norse mythology. According to the myth, Fenrir was one of the three offspring of the god Loki and the giantess Angrboða.

 

Fenrir was feared by the gods because it was foretold that he would one day break free from his chains and bring about the destruction of the world during the events of Ragnarok. The gods attempted to bind Fenrir with a series of chains, but he broke free of them all, until the god Tyr offered his hand as a sacrifice to bind him with the unbreakable chain Gleipnir.

 

During Ragnarok, Fenrir finally broke free from his chains and fought against the god Odin, ultimately killing him. However, Odin's son Vidar avenged his father by killing Fenrir with a special boot made from all the scraps of leather that had been discarded over the years, called Valaskjálf.

 

Fenrir is often associated with themes of destruction, chaos, and the unpredictable nature of the natural world in Norse mythology.