Loki had for son a wolf called Fenrir and the Ases were told that one day, Fenrir would be a danger for their lives. They decided to capture and bring him in their house. But, as Gods, they couldn't consider to kill him, so they chose to keep in alive but captive. Only the God Tyr was courageous enough to approach him to give him food. Very quickly, he became stronger and stronger, which seriously bothered the Ases. They decided to tress a strong rope called Loeding and asked Fenrir to test his strength on that rope. As soon as he got the leash around his neck, he arched and broke the rope. The Ases decided to elaborate a second rope even stronger called Dromi.Ils They asked the wolf to try again to break it, telling him that he would be consider twice stronger as he was already. Fenrir took self-confidence and accepted the challenge. He bowed again and the rope broke one more time. The Ases were afraid not being able to chain him. They had only one solution left : to ask the dwarfs to build a magic and indestructible leash. Once that done, they invited the wolf to go with them on an island called Lyngvi which was located on Lake Amsvartnir. There they showed him the leash to test again his strength. But Fenrir was kind reticent and suspicious about the thin leash. They ended up on a compromise : they would free him if he were not able to get out of the leash, thinking he would not be as strong and dangerous as they thought. Besides his suspicions, the wolf decided to accept only if one of the Gods put his hand in his dangerous mouth, just to make sure. All the Gods looked at each other, but none was courageous enough, but the God Tyr. The wolf Fenrir bowed as strong as he could, but the more he tried, the more the leash shrank on his neck. Seeing he had been taken in fooled, he closed up his mouth and cut Tyr's hand. When the Ases saw that Fenrir was definitely chained, the GodThòrr took the rest of the leash called Gelgia,l'enroula and rounded it up around a rock called Thviti, so heavy that he could never be freed. Since then, the wolf Fenrir waits for Gods' night time to unchain himself to eat the God Odhinn .