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Then is fulfilled Hlín's / second sorrow, / when Odin goes / to fight with the wolf, / and Beli's slayer, / bright, against Surtr. / Then shall Frigg's / sweet friend fall.
— Excerpt of the Prose Edda, prophesying Odin's death

Fenrir (Old Norse for 'fen-dweller') or Fenrisúlfr ('Fenrir's wolf', often translated "Fenris-wolf"), also referred to as Hródvitnir ('fame-wolf') and Vánagandr ('monster of the River Ván') is a giant wolf from Norse mythology. Along with Hel and Jörmungandr, he is the child of Loki and the giantess Angrboða, and the father of the wolves Sköll and Hati Hróðvitnisson. He is prophesied to devour Odin in Ragnarök, only to be killed himself by Odin's son Vídar.

Along with his siblings, Fenrir was raised in Jötunheimr and captured by the gods, and brought to Asgard once the gods learned of their existence and the role they would play in Ragnarok. While Jörmungandr was thrown into the ocean and Hel was banished to Niflheim and given authority over nine worlds, Fenrir was allowed to stay in Asgard with the gods.

Initially, the relationship between the gods and Fenrir was friendly, if tense, with most gods, safe for Týr, being afraid of him. This fear grew along with Fenrir’s size and soon the gods began to look for a way to bind the wolf. They presented three leg cuffs to him under the guise of challenges of strength, all of which he broke. Lastly, they presented him with a ribbon made by the dwarves, but Fenrir had grown suspicious at this point and ordered that one of the gods put their hand in his maw to ensure they wouldn’t trick him. Týr accepted, and when Fenrir was unable to free himself he bit his hand off.

Despite being bound, Fenrir is prophesied to break free during Ragnarök, during which he will swallow the sun and devour Odin before being slain by Vídar.