In Norse mythology, Loki was one of the Aesir (the principal gods), but the cause of dissension among the gods, and the slayer of Balder. He became a member of the Aesir when Odin made Loki his blood brother. His children are the Midgard serpent Jormungander, which girdles the Earth; the wolfFenris; and Hela, goddess of death. Research Loki