Trap Generator
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Ballista Trap
An enchanted eyeball watches an area. The trap is triggered when the eye sees movement within its periphery, which causes a hidden ballista to fire. There are lots of tall arrowslits in the walls.
Effect: +6 to hit (or DC 13) against one target, 12 (2d10) piercing and poison damage
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 13) cast on the eye disables the trap.
Burning Snare
This trap is activated when an intruder steps on a hidden pressure plate that causes a snare to wrap around their leg and lift them into the air. The floor is covered in a dense layer of leaves or other loose debris to camouflage the trap.
Effect: Targets all creatures within a 10 ft. square area, DC 13 DEX save or become restrained and lifted high into the air as the rope catches on fire, dealing 8 (2d4) fire damage per turn. The fire will eventually burn through the rope, causing them to fall and take 4 (2d6) bludgeoning 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. The snare can be cut, but will cause the victim to fall if it's already been triggered.
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) | 1 (1d6) | 9 (3d6) |
| Medium (barrel, chandelier) | 2 (1d8) | 25 (4d8) |
| Large (cart, 10x10 ft. window) | 3 (1d10) | 32 (5d10) |
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