For 10 points, name this offspring of Loki, a creature from Norse myth notable for being a giant wolf.
This creature was able to break free from restraints named Leyding and Dromi, leading to the construction of Gleipnir, a harness that this creature thought it could escape from because it was thin and soft. However, when he found that he could not break it, he bit down on the hand of (*) Tyr. At Ragnarok, he will be freed from his tether with fiery gazes and breath and will kill Odin only to be killed by Odin's son, Vidar. For 10 points, name this offspring of Loki, a creature from Norse myth notable for being a giant wolf.
This creature was able to break free from restraints named Leyding and Dromi, leading to the construction of Gleipnir, a harness that this creature thought it could escape from because it was thin and soft.
{Fenrir} [or the {Fenris} wolf]