Trap Generator
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Thunder Blaster
An enchanted eyeball watches an area. The trap is triggered when the eye sees movement within its periphery, which detonates a thunder mine buried under the floor. The floor is pocked with small craters.
Effect: Targets all creatures within 20 ft., DC 15 DEX save or take 27 (4d10) thunder damage and become deafened for 4 (1d4) rounds
Trigger: motion sensing eye, an enchanted eyeball watches over the area.
Countermeasures: A spell or other effect that can sense the presence of magic, such as detect magic, reveals an aura of divination magic on the eye. A successful dispel magic (DC 15) cast on the eye disables the trap.
Poisoned Ballista Turret
A doorknob is trapped to activate when it's turned the wrong way, which causes a hidden ballista to fire. There are lots of tall arrowslits in the walls.
Effect: +7 to hit against one target, 32 (4d10) piercing and poison damage
Trigger: doorknob, activates when the doorknob is turned the wrong way.
Countermeasures: A successful DC 15 Intelligence (Investigation) check allows a character to deduce the trap's presence. A successful DC 15 Dexterity check using thieves' tools disarms the trap, disabling the trigger. Unsuccessfully attempting to pick the door triggers 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) | 4 (2d4) |
| Small (chest, lute) | 6 (1d6) | 11 (3d6) |
| Medium (barrel, chandelier) | 4 (1d8) | 19 (4d8) |
| Large (cart, 10x10 ft. window) | 8 (1d10) | 29 (5d10) |
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