Trap Generator
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Brimstone Floor
This trap is activated when an intruder steps on a hidden pressure plate that makes flaming coals and brimstone fall through small slots in the walls and cover the floor. Bits of ash and charcoal litter the area.
Effect: Targets all creatures within a 10 ft. square area, flaming coals and brimstone fall into the area and cover the floor. Any target that starts or moves through the area takes 7 (1d10) fire damage per turn.
Trigger: pressure plate, activates when 20 or more pounds are placed on it.
Countermeasures: A successful DC 10 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.
Enough water to cover the area will douse the flames and make the coals safe to cross.Eldritch Blast Trap
A pillar of light stretches the location. The trap is activated if the beam is broken by a creature or object and releases the spell stored within the trapped object. The object is covered in arcane symbols and writing.
Effect: DC 10 to find, DC 10 to disable
+4 to hit (or DC 11) against one target, Casts Eldritch Blast centered on the triggerer
Trigger: light beam, a beam of light activates the trap when broken. Casting dispel magic (DC 11) on the trap will cancel the stored spell.
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) | 6 (2d4) |
| Small (chest, lute) | 5 (1d6) | 7 (3d6) |
| Medium (barrel, chandelier) | 8 (1d8) | 22 (4d8) |
| Large (cart, 10x10 ft. window) | 6 (1d10) | 38 (5d10) |
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