Siersgrunnr is a troll who worked with Wildflower and Sunspot.

Magnus Chase and the Gods of Asgard

9 from the Nine Worlds

Speaking of Trolls ...

Siersgrunnr is called in to stop Hearthstone when he melts down a gate to gain access to an estate. He attacks the elf with his Rune Magic doing very little to stop him and takes Hearth’s Rune Stones. Hearth retreat but reappears later and recognizes Hearth. He tells Hearth he plans to be nice to him before killing him. He inadvertently tells Hearth his name and, as he is walking uses a bullhorn and a rune he kept secret to say his name. Siersgrunnr is stunned and Hearth uses a club to break his knees and knock him out.


Siersgrunnr is huge and hideous troll. Protective sun-gear covered every inch of him and bore the same security-company logo. He had a massive chest and equally muscular legs that could be seen even under his dingy white jumpsuit. He had yellow teeth and bloodshot eyes through the tinted plastic shield that hung down from his hood, covering his face. His thick gloved fingers flexed as if they itched to encircle and squeeze Hearthstone's neck. He had a thick hide, a thicker skull, and bad breath.


  • His name translates to Cheesebutt.
  • While "grunnr" does mean butt in Old Norse, "siers" means cheese in Latvian; ostr is cheese in Old Norse.
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.
Secondary Characters: Randolph Chase | Gunilla | Natalie Chase | Amir Fadlan | Alderman
Minor Characters: Annabeth Chase | Frederick Chase | Helgi | Hunding | Vala | Junior | Lars Alhstrom | Stanley | Inge | Percy Jackson | Stan | Alviss | Miles | Wildflower | Sunspot | John Henry
Norse Gods: Freya | Thor | Balder | Ullr | Frey | Odin | Heimdall | Vidar | Sif | Frigg | Tyr
Minor Gods: Skírnir | Mimir | Ran | Hod | Hel | Sigyn | Aegir | Nine Billow Maidens | Njord | Kvasir | Holler | Snorta | Forseti | Glum | Lofn | Sól
Jotnar: Surt | Gerd | Norns | Utgard-Loki | Harald | Ymir | Geirrod | Gjalp | Greip | Thrym | Thrynga | Tiny | Little Billy | Hrungnir | Red | Tattoo | Gunlod | Suttung | Baugi | Skadi | Hrym | Eggther | Norns
Monsters: Jormungand | Ratatosk | Vedrfolnir | Nidhogg | Fenris Wolf | Lindworm | Wight | Brunnmigi | Siersgrunnr | Garm
Magical Creatures: Dwarf | Elf | Sleipnir | Stanley | Marvin | Otis | Hulder | Nøkks | Vatnavaettir | Nisser | Troll | Raven | Hugin and Munin
Related Content: Rick Riordan | Hotel Valhalla Guide to the Norse Worlds | 9 from the Nine Worlds
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