Trap Generator
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Steam Trap
This trap is activated when an intruder steps on a hidden pressure plate that makes scalding hot steam fill the area via vents in the floor.
Effect: Targets all creatures within a 10 ft. square area, scalding hot steam fills the area. Any target that starts or moves through the area takes 2 (1d10) damage per turn.
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.
A strong gust of wind (at least 10mph) will disperse the steam.Poison Needle
This trap is activated when a creature touches its surface, which causes the needle to spring out, delivering a dose of poison.
Effect: Targets any creature that touches it, Placed in lock or opening mechanism, dealing 9 (1d10) poison damage and DC 10 CON save or be poisoned for 1 hour.
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 10) cast on the surface destroys the trap.
Destroying the mechanism will prevent the trap from triggering but also render the object unopenable.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) | 2 (2d4) |
| Small (chest, lute) | 6 (1d6) | 11 (3d6) |
| Medium (barrel, chandelier) | 5 (1d8) | 21 (4d8) |
| Large (cart, 10x10 ft. window) | 1 (1d10) | 28 (5d10) |
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