Hymir's cowardice saved the life of another of these creatures; that one was briefly disguised as a cat by Utgard-Loki.
Pliny the Elder claimed that the mortal enemy of these beings was a creature that coated itself in several layers of mud before fighting them, called the ichneumon. The Slavic god Perun's rival Veles often took the form of one of these creatures. Tvashta created one of them to avenge the death of his son Trisiras; in an earlier story, that creature of this type had 99 fortresses in which he imprisoned the (*) waters of the world. Hymir's cowardice saved the life of another of these creatures; that one was briefly disguised as a cat by Utgard-Loki. Indra used his thunderbolt to kill one of these beings named Vritra, while another one will kill and be killed at Ragnarök by Thor. Jörmungandr is the "Midgard" example of, for 10 point, what animal depicted eating itself in an  ouroboros ?
Pliny the Elder claimed that the mortal enemy of these beings was a creature that coated itself in several layers of mud before fighting them, called the ichneumon.
snake s [or  serpent s; or  sorm r; accept  dragon s or world  serpent s]