Trap Generator
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Spiked Boulder
This trap is activated when an intruder steps on a hidden pressure plate that opens a hidden trapdoor in the ceiling, releasing the object that runs down the corridor and tramples anyone in its way. The ceiling is covered in stalactites or vines to conceal it.
Effect: Initiative +3, moves 60 ft. in a straight line each turn. If it enters another creature's space, DC 13 DEX save or take 63 (10d10) bludgeoning damage and knocked prone
Trigger: pressure plate, activates when 20 or more pounds are placed on it.
Countermeasures: A successful DC 15 Wisdom (Perception) check will spot the pressure plate, and wedging an iron spike or other object under the pressure plate prevents the trap from activating.
The object stops when it hits a wall or similar barrier. As an action, a creature within 5 feet of it can attempt to slow it down with a DC 13 Strength check. On a successful check, the object's speed is reduced by 15 feet.Thunder Turret
A trivially easy riddle etched on a surface is enchanted to trigger when the answer is heard, which detonates a thunder mine buried under the floor. The floor is pocked with small craters.
Effect: Targets all creatures within 20 ft., DC 13 DEX save or take 71 (10d10) thunder damage and become deafened for 4 (1d4) rounds
Trigger: false riddle, activates when an easy riddle is answered correctly.
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 riddle. A successful dispel magic (DC 13) cast on the riddle destroys the trap.
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) | 1 (1d4) | 2 (2d4) |
| Small (chest, lute) | 3 (1d6) | 7 (3d6) |
| Medium (barrel, chandelier) | 6 (1d8) | 20 (4d8) |
| Large (cart, 10x10 ft. window) | 6 (1d10) | 19 (5d10) |
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