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Spoilers for Books 1–8
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All eight books included

Power systems · Introduced in Book 2
Guard-depot Soul Crystal and amplifier
The guard depot uses a C-grade Soul Crystal and an amplifier to gather ambient soul energy. The assembly powers the guards and also feeds energy into the imprisoned Remex.[1]
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A dangerous power assembly
The C-grade crystal can shatter when touched by living flesh. That weakness makes the power system dangerous to handle.[1]
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Different crystal categories
Mordecai later explains that ordinary soul-powered crystals are different from Memorial Crystals, which preserve a dead divinity’s memories and knowledge. The crystal offered by Imogen belongs to that second category.[2]
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History
Book 2
Carl’s Doomsday Scenario
The crystal and amplifier power the depot’s guards while leaking energy into Remex. Feedback from the amplifier kills Featherfall.[1]
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Sources
References are to Matt Dinniman’s novels. Book links open our recap guides.
- Carl’s Doomsday Scenario, Chapter 24.
- The Butcher’s Masquerade, Chapter 69.