Trap Generator
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Arrow Trap
A phrase etched on a wall is enchanted to trigger when read aloud, which causes arrows to fire from small openings in the wall. The room contains a porous wall and broken arrows.
Effect: +3 to hit (or DC 10) against one target, 8 (1d10) piercing damage
Trigger: forbidden phrase, activates when etched runes are read aloud.
Countermeasures: A spell or other effect that can sense the presence of magic, such as detect magic, reveals an aura of divination magic around the phrase. A successful dispel magic (DC 10) cast on the phrase destroys the trap. Plugging the arrow holes with cloth or other material will prevent them from firing.
Fire Bolt Trap
This trap uses a trip wire that releases the spell stored within the trapped object. The object is covered in arcane symbols and writing.
Effect: +3 to hit (or DC 10) against one target, Casts Fire Bolt centered on the triggerer
Trigger: trip wire, activates when wire is tripped.
Countermeasures: A successful DC 10 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 10) on the trap will cancel the stored spell.
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) | 2 (2d4) |
| Small (chest, lute) | 1 (1d6) | 13 (3d6) |
| Medium (barrel, chandelier) | 8 (1d8) | 19 (4d8) |
| Large (cart, 10x10 ft. window) | 10 (1d10) | 39 (5d10) |
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