Trap Generator
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Magic Missle Trap
This trap is activated when an intruder steps on a hidden pressure plate that activates a magic imbued trap that casts magic missile at the target. The surface is covered with arcane symbols and writings.
Effect: One target, 2 (1d10) force damage
Trigger: pressure plate, activates when 20 or more pounds are placed on it.
Countermeasures: A successful DC 20 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. Casting dispel magic (DC 10) will prevent the missiles from firing.
Steam Trap
An enemy in disguise asks for help and triggers the trap when the PCs get close, which makes scalding hot steam fill the area via vents in the floor. The floor is perforated or mesh.
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 10 (1d10) fire damage per turn.
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 15 Dexterity check using thieves' tools disarms the trap. A strong gust of wind (at least 10mph) will disperse the steam.
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) | 4 (1d4) | 4 (2d4) |
| Small (chest, lute) | 4 (1d6) | 13 (3d6) |
| Medium (barrel, chandelier) | 5 (1d8) | 9 (4d8) |
| Large (cart, 10x10 ft. window) | 4 (1d10) | 28 (5d10) |
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