Sigyn stayed a loyal wife to Loki when the gods punished him for the death of Balder. After the Trickster was chained to three large boulders with a poisonous snake above his head, she caught most of the dripping venom in a bowl. But it’s Angrboda, the Giantess, who is the mother of his children.
Fenrir is the eldest of the three. Fierce and terrible in his wolf form, he was captured by the gods in the middle of the night from his mother’s hall and kept captive in Asgard. There he grew so large and fierce that only Tyr was brave enough to feed him. And that cost Tyr his arm! The gods became so afraid of Fenrir they decided to bind him, (killing was forbidden in Asgard) and so made a chain of iron links called Læding. They challenged the Great Wolf to be bound up in the chain to test his strength. Fenrir took the challenge and broke the bonds with no problem.
The gods then quickly made another chain from larger links, larger than even anchor chains, and they called it Dromi. They challenged Fenrir once more, and again he broke it with no problem, for he had grown even stronger since his breaking of Læding. The gods were now truly terrified.
Odin sent Freya’s servant Skirnir out into the nine worlds to find someone to make a chain strong enough to bind the giant wolf. Skirnir went to the land of the dwarves in Svartalfheim where they devised a silk rope called Gleipnir. Now Gleipnir was no ordinary silk rope. It was made from the sound a cat makes when it moves, a woman’s beard, the roots of a mountain, the sinews of a bear, the breath of a fish and spit from a bird.
Skirnir hurried back to Asgard with the silk rope and gave it to Odin. The Allfather invited Fenrir to the island of Lyngvi in middle of Lake Amsvartnir to test his strength. Fenrir took the challenge. However, when he saw Gleipnir, he suspected that magic was involved and hesitated until Tyr offered to place his right hand into Fenrir’s mouth. Fenrir was bound, but when he couldn’t break the rope, he bit off Tyr’s hand.
The gods then took a chain called Gelgja and tied it to Gleipnir, then tied Gelgja to a boulder called Gjoll and drove Gjoll one mile into the earth. After that was done, they placed an even larger boulder called Thviti on top of Gjoll.
The gods then gagged Fenrir with a sword, placing the tip on the roof of his mouth and the hilt on his lower jaw. And that is where he will be until Ragnarok !
When Ragnarok comes, Fenrir’s chain will break, and he will join his father, brother, sister and the giants in the mighty battle that will end the nine worlds. Fenrir and Odin will be the first to engage into battle, but in the end he will swallow Odin, killing the Allfather. Odin’s son Vidar will then come forward to tear Fenrir apart avenging his father and killing the wolf son of Loki.