Trap Generator
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Spinning Blades
An enemy in disguise asks for help and leads the PCs into the trap and triggers it, which releases spinning blades in the floor or walls. The blades move back and forth along a track, cutting up anything or anyone in their path. There's tall arrowslits in the walls and tracks on the floor.
Effect: Initiative +4, moves 60 ft. in a straight line each turn. If it enters another creature's space, 20 (4d10) slashing damage. Moves back and forth along a track.
Trigger: enemy, an enemy in disguise asks for help.
Countermeasures: A successful DC 20 Insight check can tell that the enemy is lying. A successful DC 10 Dexterity check using thieves' tools disarms the trap.
Boiling Tar-Filled Room
This trap is activated when an intruder steps on one of the alternating hidden pressure plates that makes the doors slam shut and the area gradually fill with the caustic liquid. There's little puddles of the liquid about the area.
Effect: Initiative +4, doors seal shut and room fills up with 2 ft. of liquid per turn, dealing 28 (4d10) damage. After 1+(CON bonus) minutes (min 1) of holding breath your HP drops to 0.
Trigger: alternate tiles, activates when 20 or more pounds are placed on alternating floor tiles.
Countermeasures: A successful DC 20 Intelligence (Investigation) check will deduce that the alternating floor tiles are pressure plates, and wedging an iron spike or other object under the pressure plates prevents the trap from activating. Alternatively, step on the safe floor tiles in alternating order. The doors can be opened with a DC 10 Dexterity check using thieves' tools.
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) | 5 (2d4) |
| Small (chest, lute) | 3 (1d6) | 5 (3d6) |
| Medium (barrel, chandelier) | 4 (1d8) | 19 (4d8) |
| Large (cart, 10x10 ft. window) | 7 (1d10) | 27 (5d10) |
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