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Spoilers for Books 1–8
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All eight books included

Trap components · Introduced in Book 1
Spike and Alarm Modules
Spike and Alarm Modules are ready-to-use traps Donut receives as rewards. Carl can deploy them as they are or modify them at a crafting table.[1]
Choose Book 1 or later above to read this section.
Deployment and modification
The Alarm Module responds to hostile mobs marked red on the map. Carl’s Trap Engineer ability lets him add Fear to a trap while working at a table. Backfire guarantees that he can recover a trap that has not gone off.[2]
Choose Book 3 or later above to read this section.
History
Book 1
Dungeon Crawler Carl
Choose Book 1 or later above to read this section.
Book 3
The Dungeon Anarchist’s Cookbook
With Drek swarming the train, Carl puts the saved modules in its forward gangway. The Alarm Module plays a loud song while the Spike Module repeatedly drives spikes through a one-meter-square patch of floor. Carl earns experience from the trap as the creatures enter it.[2]
Choose Book 3 or later above to read this section.
Sources
References are to Matt Dinniman’s novels. Book links open our recap guides.
- Dungeon Crawler Carl, Chapter 44.
- The Dungeon Anarchist’s Cookbook, Chapter 1.