Brunnmigi

Brunnmigi are spirits who urinated in wells and are able to assume forms of their will.

Magnus Chase and the Gods of Asgard

The Hammer of Thor

Inge tells Magnus about the Brunnmigi named Pees-in-the-well (the only known one) who attacked and killed Hearthstone's brother Andiron in the form of a blue bear-wolf while the former's back was turned.

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 \| Stan \| Alviss \| Miles
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 \| Balder \| Holler \| Snotra \| Forseti \| Glum \| Lofn
Jotnar:	Surt \| Utgard-Loki \| Harald \| Ymir \| Geirrod \| Gjalp \| Greip \| Thrym \| Thrynga \| Tiny \| Little Billy \| Hrungnir \| Red \| Tattoo \| Gunlod \| Suttung \| Baugi \| Skadi \| Hrym \| Eggther
Monsters:	Jormungand \| Ratatosk \| Vedrfolnir \| Nidhogg \| Fenris Wolf \| Lindworm \| Wight \| Brunnmigi \| Siersgrunnr \| Garm
Magical Creatures:	Dwarf \| Elf \| Sleipnir \| Stanley \| Marvin \| Otis \| Jotunn \| Hulder \| Nøkks \| Vatnavaettir \| Nisser \| Troll
Related Content:	Rick Riordan \| Hotel Valhalla Guide to the Norse Worlds \| 9 from the Nine Worlds

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Magnus Chase and the Gods of Asgard

The Hammer of Thor