Lindwyrms are primordial dragon-like creatures native to Yggdrasil, including Níðhögg, and her children.
European Mythology[]
The Lindworm (worm meaning Snake), also spelled Lyndwyrm or Lindwurm, is a mythical creature in Northern and Central European folklore. It lives deep in the forest and, according to tradition, has the shape of a giant monstrous serpent. It can be seen as a sort of dragon.
According to legend, everything that lies under the lindworm will increase as the lindworm grows, which gave rise to tales of dragons that become richer by brooding over treasure. Another legend tells of two other kinds of lindworms, a good one associated with luck, often a prince who was cursed into a beast, and a bad one, who is a dangerous man-eater, which will attack humans on sight.
God of War Ragnarök[]
Lindwyrms are the spawn of Níðhögg. They are a naturally mischievous race that were only kept in check by their mother. Following Niddhogg's death, her six babies escape into various realms and cause trouble. Ratatoskr, saddened, but understanding of why she was killed, tasks Kratos with retrieving the young Lindwyrms so that the squirrel can raise them to handle their mother's responsibilities himself, giving the babies a father-figure and giving Ratatoskr some company he desires, also amusedly stating that the baby Lindwyrms are starting to recognize him as their new father rather than as a potential snack.
Like their mother, they can create tears in the Realm, however, it is to a lesser degree.