Magnus Chase NINE WORLDS Target
The Sword of Summer

Yggdrasil (pronounced "IG-druh-sill") is an immense tree that serves as the connection between the Nine Worlds. The gods go to Yggdrasil daily to assemble their things. Known as the World Tree, Yggdrasil's branches extend far into the heavens, and the tree is supported by three roots that extend far away into other locations. There are also creatures that live within Yggdrasil.

Magnus Chase and the Gods of Asgard

The Sword of Summer

Magnus Chase, Samirah al-Abbas, Blitzen, and Hearthstone climb the World Tree to get to Nidavelliar, but Magnus and Blitz are separated from Sam and Hearth when they run into the squirrel Ratatoskr.


in The Sword of Summer, Magnus described Yggdrasil's smallest branches being as large as an average redwood, while the biggest ones being wider than Interstate 93. As for the tree's trunk, it is so immense, that it just didn’t compute with Magnus. Each crevice in its surface seems to lead to a different one of the Nine Worlds, "as if someone had wrapped tree bark around a column of television monitors glowing with a million different movies."

Beyond the tree’s canopy nothing but a hazy white glow of the primordial Ginnungagap mist can be seen. No ground can be seen below either, only more branches crisscrossing the void.

The Nine Worlds

  • Asgard - Home of the Æsir tribe of gods and goddesses.
  • Vanaheim - Home to the Vanir tribe of gods and goddesses.
  • Muspellheim - Primordial world of fire and home to the Fire Giants.
  • Helheim - world of the eponymous goddess Hel and the dead.


  • Yggdrasil's roots extend into three locations: Urðarbrunnr (Old Norse: “Well of Urðr”), Hvergelmir (Old Norse: “bubbling" or "boiling spring”), and Mímisbrunnr (Old Norse: “Well of Mímir"). As seen in the Poetic Edda poem, Grímnismál (Old Norse: "Sayings of Grímnir"), various creatures dwell within the World Tree, including:
    • Níðhöggr (Old Norse: “Malice striker”), a massive dragon/serpent-like being that gnaws at its root(s), an unnamed eagle, and the hawk Veðrfölnir (Old Norse: “wind bleached” or “wind-witherer”), who sits between its eyes, along with the four stags Dáinn, Dvalinn, Duneyrr, and Duraþrór.
  • The Norns (Old Norse: Nornir) - Urðr (Old Norse: “fate”), Verðandi (Old Norse: possibly “happening” or “present”), and Skuld (Old Norse: possibly “debt” or “future”) - attend to Yggdrasil, weaving the fates of both gods and men. 
  • The story of Jack and the Beanstalk was inspired by Yggdrasil.


Magnus Chase and the Gods of Asgard
Core Series: The Sword of Summer | The Hammer of Thor | The Ship of the Dead
Main Characters: Magnus Chase | Alex Fierro | Blitzen | Halfborn Gunderson | Hearthstone | Loki | Mallory Keen | Samirah al-Abbas | Sumarbrander | Thomas Jefferson Jr.
Minor Characters: Annabeth Chase | Frederick Chase | Randolph Chase | Helgi | Hunding | Gunilla | Junior | Lars Alhstrom | Amir Fadlan | Alderman | Inge | Percy Jackson
Norse Gods: Freya | Thor | Ullr | Frey | Odin | Heimdall | Vidar | Sif | Frigg | Tyr
Minor Gods: Skírnir | Norns | Mimir | Ran | Hel | Sigyn | Aegir | Nine Billow Maidens | Njord
Jotnar: Surt | Utgard-Loki | Harald | Ymir | Geirrod | Gjalp | Greip | Thrym | Thrynga | Tiny | Hrungnir | Red | Tattoo | Gunlod | Suttung | Baugi | Skadi | Hrym
Monsters: Jormungand | Ratatosk | Vedrfolnir | Nidhogg | Fenris Wolf | Lindworm | Wight | Brunnmigi
Magical Creatures: Dwarf | Elf | Sleipnir | Stanley | Marvin | Otis | Jotunn | Hulder | Nøkks | Vatnavaettir | Nisser
Related Content: Rick Riordan | Hotel Valhalla Guide to the Norse Worlds | 9 from the Nine Worlds