| Spoiler Alert!
Warning! This page contains spoilers for The Sword of Summer.
While Gunilla was giving Magnus a tour of Valhalla, she accidentally took the elevator to Muspellheim, burning herself badly when the doors opened. Much later at Fenris Wolf's prison, Magnus uses Sumarbrander to banish Surt and his Fire Giants back to Muspellheim.
- Muspellheim and Niflheim were the first two worlds in existence.