Trap Generator
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Falling Door Trap
This trap is activated when a creature touches its surface, which causes the false door to fall forward onto anyone in front of it. The door looks damaged and poorly made.
Effect: Targets any creature that touches it, DC 11 DEX save or take 1 (1d10) bludgeoning damage and knocked prone.
Trigger: touch trigger, activates when surface is touched by a creature.
Countermeasures: A spell or other effect that can sense the presence of magic, such as detect magic, reveals an aura of divination magic around the surface. A successful dispel magic (DC 11) cast on the surface destroys the trap. Damaging the door causes the trap to trigger. A crowbar or iron wedge can be used from the side to tip over the door safely.
Arrow Trap
A door or chest is rigged to activate when opened, which causes arrows to fire from small openings in the wall. The room contains a porous wall and broken arrows.
Effect: +3 to hit (or DC 11) against one target, 10 (1d10) piercing damage
Trigger: door, activates when a door or chest is opened.
Countermeasures: Spotting the attached wire is a DC 10 Wisdom (Perception) check. A successful DC 10 Dexterity check using thieves' tools breaks the wire attached to the door harmlessly. A character without thieves' tools can attempt this check with disadvantage using any edged weapon or edged tool. On a failed check, the trap triggers. Plugging the arrow holes with cloth or other material will prevent them from firing.
Destroying Traps
Traps can be damaged and destroyed, sometimes to good or bad effect. Pipes containing fire or poison will rupture and spray over the area, while mechanisms can be rendered inoperable with enough force. Determine the HP and AC of your traps based on the tables below. Sometimes a fragile trap is more dangerous than a resilient one if destroying it will fill the corridor with acid.
| Substance | AC |
|---|---|
| Cloth, paper, rope | 11 |
| Crystal, glass, ice | 13 |
| Wood, bone | 15 |
| Stone | 17 |
| Iron, steel | 19 |
| Mithral | 21 |
| Adamantine | 23 |
| Size | HP (Fragile) | HP (Resilient) |
|---|---|---|
| Tiny (bottle, lock) | 3 (1d4) | 6 (2d4) |
| Small (chest, lute) | 2 (1d6) | 7 (3d6) |
| Medium (barrel, chandelier) | 7 (1d8) | 19 (4d8) |
| Large (cart, 10x10 ft. window) | 4 (1d10) | 25 (5d10) |
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