The Norns tend Yggdrasil daily, drawing water from the Well of Urðr and mixing it with clay to pour over the tree's roots, healing the damage done by Níðhöggr and other creatures.
Níðhöggr perpetually gnaws at Yggdrasil's roots in Hvergelmir, seeking to destroy the World Tree. Ratatoskr carries insults between Níðhöggr and the eagle atop the tree, fueling their enmity.
Yggdrasil, the great ash tree, holds the Nine Worlds within its branches and among its three roots, each realm sheltered in the cosmic structure that binds all of existence together from the fires below to the halls above.
The Æsir hold their daily council at Urðarbrunnr beneath Yggdrasil, where the Norns tend the world tree, as described in Völuspá and Gylfaginning.
Heimdall's hearing lies hidden beneath the holy tree Yggdrasil, pledged at the well where Odin left his eye, the price of the watchman's preternatural senses.
⚠ Völuspá 27 is ambiguous — 'Heimdallar hljóð' may mean his hearing or the Gjallarhorn itself. Scholarly interpretation varies.
Hoddmímir's Wood shelters Líf and Lífþrasir through Ragnarök within Yggdrasil, the world-tree that endures the destruction of the cosmos and sustains the last human survivors on morning dew.
⚠ The identification of Hoddmímir's holt (Vafþrúðnismál 45) with Yggdrasil follows Snorri's reading in Gylfaginning 53; some scholars treat them as distinct.
Yggdrasil's third root stretches down to Hvergelmir in Niflheim, a primordial spring from which all rivers flow. Níðhöggr and countless serpents dwell there gnawing at the root.
Yggdrasil's second root extends to Mímisbrunnr, the well of wisdom in the realm of the frost giants. Odin sacrificed an eye for a drink from this well, as told in the Völuspá.
Odin hung himself on the World Tree Yggdrasil for nine nights, pierced by his own spear, to gain the wisdom of the runes.
Yggdrasil trembles and groans as Ragnarök begins, the ancient ash shuddering from root to crown as the bonds of the world loosen and the forces of chaos break free.
Ratatoskr runs ceaselessly up and down the trunk of Yggdrasil, bearing spiteful words between the eagle at the crown and Níðhöggr at the roots, a restless messenger woven into the World Tree's eternal drama.
Odin hung on Yggdrasil for nine nights to discover the Runes, making the world-tree the site of the primordial runic revelation described in the Hávamál.
Yggdrasil's first root reaches to Urðarbrunnr in Asgard, where the Norns dwell and tend the tree by pouring the well's sacred waters over its roots, as described in the Prose Edda.
Veðrfölnir's Eagle perches at the crown of Yggdrasil with the hawk Veðrfölnir between its eyes, surveying the Nine Worlds from the highest point in the cosmos, as described in Gylfaginning.
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