Gylfaginning XV (Brodeur)

Chapter fifteen of Snorri Sturluson's Gylfaginning, in Arthur Gilchrist Brodeur's translation, describes the world tree Yggdrasil and, among the beings that dwell around its roots, the serpent Nidhogg, who gnaws continually at the tree's lowest root from beneath. The passage locates Nidhogg within a wider ecology of hostile and monstrous creatures gathered at Yggdrasil, more than any man can imagine, and connects the tree's endurance to an ongoing, unresolved struggle rather than to any final, settled peace. Gylfaginning presents this gnawing not as a distant or symbolic detail but as a present, continuous fact of the cosmos as the text describes it standing at the time of telling, one of several threats the world tree survives moment to moment alongside deer that graze its branches and the eagle that perches at its top, with a squirrel named Ratatosk said to run up and down the trunk carrying insults between the eagle above and Nidhogg below. The chapter ties Nidhogg's activity to the tree's roots specifically, distinguishing this threat from the branches and crown, which face separate dangers described nearby in the same section of the Prose Edda, so Yggdrasil is shown under strain from more than one direction at once rather than from Nidhogg's gnawing alone.

Nidhogg's gnawing at Yggdrasil's root became one of Norse mythology's most durable images of a world sustained under continuous strain rather than secured once and settled. The Poetic Edda's Voluspo names Nidhogg again at the poem's very end, gnawing corpses and carrying the dead on its wings even after the cataclysm of Ragnarok, so the serpent's threat to the world tree is presented across more than one source as older than any single mythic crisis and as surviving beyond it. Modern popularizations of Norse myth have often treated Nidhogg as the story's antagonist in a simple sense, but scholars working from the primary poems caution that the sources give the serpent no personality, motive or narrative arc of its own, only a fixed and repeated activity at the tree's root, mentioned in passing rather than developed as a character the way Odin or Loki are. Read this way, the figure functions less as a villain to be defeated than as a standing image of decay working permanently against the structure that holds the nine worlds together, a threat the mythology never resolves because resolving it was never the point of including it in the first place, a contrast scholars draw with figures like Fenrir or Jormungand whose stories do reach a decisive, narrated end at Ragnarok.