Trap Generator
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Falling Block
An idol or other valuable object's weight is keeping a pressure plate depressed just the right amount. If the pressure plate raises or lowers it collapses the supports keeping an unstable section of a ceiling in place. There are shoddy-looking supports scattered around the area.
Effect: Targets all creatures within a 10 ft. square area, DC 13 DEX save or take 19 (2d10) damage
Trigger: pedestal, activates when an idol or other object is removed from a pedestal.
Countermeasures: A successful DC 10 Intelligence (Investigation) check allows a character to deduce the trap's presence. Placing an object of equal weight on the pedestal prevents the trap from triggering. A successful DC 15 Dexterity (Sleight of Hand) check makes the switch without causing the weight on the pedestal to change. Unsuccessfully attempting the swap triggers the trap. The supports holding up the section can be destroyed, triggering the trap from a safe distance.
Acid Spray
A trigger is hidden within a treasure chest's lock, or in something else that a creature might open. Opening the chest without the proper key causes acid to spray from a hidden nozzle. The walls are covered in foliage or perforated stone.
Effect: Targets all creatures within a 20 ft. cone, DC 13 save or take 10 (2d10) acid damage for 4 (1d4) rounds
Trigger: lock trigger, activates when opened without the proper key.
Countermeasures: A successful DC 10 Intelligence (Investigation) check allows a character to deduce the trap's presence. A successful DC 15 Dexterity check using thieves' tools disarms the trap, disabling the trigger. Unsuccessfully attempting to pick the lock triggers the trap. Attempting to destroy the trap causes the pipes to rupture and spray acid over the area.
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) | 2 (1d4) | 4 (2d4) |
| Small (chest, lute) | 4 (1d6) | 9 (3d6) |
| Medium (barrel, chandelier) | 3 (1d8) | 14 (4d8) |
| Large (cart, 10x10 ft. window) | 8 (1d10) | 39 (5d10) |
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