In Norse mythology, Loki's monstrous wolf child is named Fenrir. Fenrir, a giant wolf, is prophesied to play a significant role in Ragnarok, the end of the world in Norse beliefs. His immense strength and ferocity make him a fearsome figure, eventually leading to the death of Odin, the chief god. Fenrir's fate is intertwined with Loki, who is both his father and a pivotal character in Norse mythos, symbolizing chaos and trickery.