Trap Generator
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Ray of Frost Trap
A denizen of the lair is hiding nearby out of sight watching for intruders to enter the trap's radius. When a hostile creature is spotted, the sentry pulls on a rope that releases the spell stored within the trapped object. The object is covered in arcane symbols and writing.
Effect: +3 to hit (or DC 11) against one target, Casts Ray of Frost centered on the triggerer
Trigger: sentry, a sentry is hidden in a hole or around a corner with a rope that activates the trap when pulled.
Countermeasures: The sentry is a regular denizen of the dungeon, stealthed in a nearby hiding spot. A successful DC 15 Wisdom (Perception) check spots the sentry, and the sentry will activate the trap when they see enemies standing within range of it. Disabling, avoiding, or scaring off the sentry will render the trap harmless. Casting dispel magic (DC 11) on the trap will cancel the stored spell.
Magic Missle Trap
This trap uses a trip wire that activates a magic imbued trap that casts magic missile at the target. The surface is covered with arcane symbols and writings.
Effect: One target, 3 (1d10) force damage
Trigger: trip wire, activates when wire is tripped.
Countermeasures: A successful DC 15 Wisdom (Perception) check will spot the trip wire, and a DC 10 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. Casting dispel magic (DC 11) will prevent the missiles from firing.
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) | 4 (2d4) |
| Small (chest, lute) | 4 (1d6) | 10 (3d6) |
| Medium (barrel, chandelier) | 3 (1d8) | 23 (4d8) |
| Large (cart, 10x10 ft. window) | 4 (1d10) | 29 (5d10) |
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