Soul engines are a type of building summoned by the Burning Legion alongside the Legion Structures and Legion ships. The soul engine is where harvested souls are collected and stored to power the Legion's war machine(s). Some jailer demons are responsible for capturing souls and fueling the engines. They have two floors.
- Soul Engine on Mardum
- Soul Engine: Apocalypse in Faronaar
- Unlabeled Felsoul Hold soul engine
- One in the Black City that becomes the Soul Ruin
- The Spirit Crucible