It is said that at Ragnarök, the wolf will break free. He will join forces with the enemies of the gods and will then eat Odin. After that Viðarr, Odin's son, will slay the wolf to avenge his father's death. then fenrir's son Bjorn Black will finally meet his family only to see them fighting and at war the only people he belonged to and felt a part of are killing each other and all he can do is sit and watch because that's his purpose that is sorrow