Trap Generator
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Ballista Trap
A fragile glass figurine is precariously perched on a pedestal at the end of a hallway. Strong enough vibrations can cause the figurine to fall and shatter, triggering the trap that causes a hidden ballista to fire. There are lots of tall arrowslits in the walls.
Effect: +8 to hit (or DC 15) against one target, 12 (2d10) piercing and poison damage
Trigger: shatter, activates when a precariously balanced glass figurine falls and shatters.
Countermeasures: A spell or other effect that can protect the figurine from shattering, such as feather fall, will disarm the trap. A successful DC 15 Dexterity (Sleight of Hand) check will carefully remove the figurine without breaking it. Disruptive effects like combat or running will vibrate the figurine and cause it to fall.
Man-Eating Plant
This trap uses a trip wire that opens a wall to reveal a huge man-eating plant that tries to eat anyone nearby. All surfaces are covered in plants and foliage, except for a section of wall.
Effect: Initiative +4, +8 to hit against one target, a wall opens to reveal a huge man-eating plant which tries to eat anyone nearby. The plant deals 14 (2d10) piercing damage on a hit. Targets hit by the plant are restrained until it's killed or they escape with a DC 15 STR check.
Trigger: trip wire, activates when wire is tripped.
Countermeasures: A successful DC 15 Wisdom (Perception) check will spot the trip wire, and a DC 15 Dexterity check using thieves' tools disables the trip wire harmlessly. A character without thieves' tools can attempt this check with disadvantage using any edged weapon or edged tool. On a failed check, the trap triggers. The plant is immobile and vulnerable to fire damage. It will not distinguish between allies, enemies, or already dead targets, and will not grab more than 2 targets at a time.
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) | 8 (2d4) |
| Small (chest, lute) | 5 (1d6) | 9 (3d6) |
| Medium (barrel, chandelier) | 8 (1d8) | 15 (4d8) |
| Large (cart, 10x10 ft. window) | 2 (1d10) | 21 (5d10) |
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