Trap Generator
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Ballista Trap
This trap activates when a ruby or other valuable item is pried from a statue or other surface, that causes a hidden ballista to fire. There are lots of tall arrowslits in the walls.
Effect: +6 to hit (or DC 15) against one target, 8 (2d10) piercing and poison damage
Trigger: removal trigger, activates when a gem or other valuable item is removed.
Countermeasures: A successful DC 10 Intelligence (Investigation) check allows a character to find a wire attached to the item which triggers the trap when pulled. A successful 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.
Crushing Walls
A doorknob is trapped to activate when it's turned the wrong way, which causes the walls close in and crush anyone trapped between. There's crushed debris in the middle of the area, and scratches on the floor.
Effect: Targets all creatures within a 10 ft. square area, DC 15 DEX save or take 15 (2d10) bludgeoning damage
Trigger: doorknob, activates when the doorknob is turned the wrong way.
Countermeasures: A successful DC 10 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. A sufficiently strong brace can be bridged between the walls and prevent them from closing. Higher level traps close faster and with greater force.
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) | 8 (2d4) |
| Small (chest, lute) | 4 (1d6) | 13 (3d6) |
| Medium (barrel, chandelier) | 7 (1d8) | 9 (4d8) |
| Large (cart, 10x10 ft. window) | 1 (1d10) | 38 (5d10) |
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