Ragnarok is the Norse term meaning Twilight of the Gods in which the rein of the gods ends in their death.

Loki is the trickster God, blood brothers with Odin and child of giants. He has three main children.

Jörmungandr also know as the Midgard Serpent or World Snake. He is a snake who was cast into the depths of the dark ocean where he grew to a humongous size able to encircle the earth.

Fenrir also known as Vánagandr (meaning monster of the river Van) Fenrir is the father of Sköll and Hati and son of Loki. It is for told that he kills Odin in the Ragnarok and is then killed by Odin's son Víðarr (Vidar).

Hel is his daughter, Hel is a being who presides over a realm of the same name, where she receives a portion of the dead. Odin bestowed upon her authority over nine worlds, in that she must administer board and lodging to those sent to her, and that is those who die of sickness or old age.

By the jötunn Angrboða, Loki is the father of Hel, the wolf Fenrir, and the world serpent Jörmungandr. By his wife Sigyn, Loki is the father of Narfi and/or Nari. By the stallion Svaðilfari, Loki is the mother—giving birth in the form of a mare—to the eight-legged horse Sleipnir.