Dungeon Traps Roll Table [d20]
Traps are as much a part of dungeon design as stone walls and torchlight. Below is a set of twenty modular traps for any fantasy TTRPG. Each entry is fully described with trigger and effect. Roll below, or use the d20 table for analog play.
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d20 Trap Table
| d20 | Trap |
|---|---|
| 1 | Wall Spears — A slightly sunken flagstone conceals a pressure plate. Stepping here unleashes spring-loaded spears from the wall, thrusting across the chamber. (Trigger: pressure plate; DC 13 DEX; 1d8 piercing) |
| 2 | Swinging Blade — A thin tripwire at ankle height snaps, releasing a heavy rusted blade from the ceiling. It swings in a deadly arc. (Trigger: tripwire; DC 14 DEX; 1d10 slashing) |
| 3 | Dart Slits — Narrow wall seams hide dart tubes. A hidden floor plate fires a spray of darts into the room. (Trigger: pressure plate; DC 13 DEX; 1d6 piercing) |
| 4 | Ceiling Collapse — A cracked tile supports a brace above. When stepped on, rubble drops from the ceiling. (Trigger: false tile; DC 12 DEX; 1d6 bludgeoning, pinned if failed) |
| 5 | Rubble Pit — A hollow beneath a false slab flips inward, dropping the victim into jagged rubble. (Trigger: false slab; DC 13 DEX or fall 10 ft; 1d6 bludgeoning) |
| 6 | Chute Floor — A hinged stone panel tips open, sending the target down a short chute into a lower chamber. (Trigger: floor panel; DC 13 DEX or fall 10–15 ft; 1d6 bludgeoning) |
| 7 | Swinging Timber — A concealed rope releases a massive timber, swinging across the chamber. (Trigger: trip line; DC 14 DEX; 2d6 bludgeoning) |
| 8 | Rune Burst — A faint rune on a flagstone flares with force when disturbed. (Trigger: rune tile; DC 13 WIS; 2d6 force) |
| 9 | Poisoned Chest — An iron chest hides a poisoned needle in its lock. (Trigger: lock tampering; 1d4 piercing + DC 12 CON or poisoned 1 hr) |
| 10 | Poison Vent — A grate hisses with green vapor when a plate is disturbed. (Trigger: pressure plate; DC 13 CON; 1d6 poison + poisoned 1 min) |
| 11 | Acid Idol — A stone idol spits acid when touched or moved. (Trigger: idol tampering; DC 13 DEX; 2d6 acid) |
| 12 | Rope Snare — A concealed rope loop snaps tight, yanking the target upward. (Trigger: snare loop; DC 12 DEX or restrained) |
| 13 | Rotten Planks — A floor section of disguised wood splinters under weight, dropping the victim into a shallow shaft. (Trigger: false floor; DC 13 DEX or fall 15 ft; 2d6 bludgeoning) |
| 14 | Biting Chest — A false chest’s lid snaps shut with jagged teeth when opened. (Trigger: chest lid; DC 13 DEX; 1d8 piercing, restrained if fail) |
| 15 | Tilting Slab — A pivoting stone slab tips and slides intruders into a trench. (Trigger: pivot slab; DC 13 DEX or fall 10 ft; 1d6 bludgeoning) |
| 16 | Blade Panel — A wall panel bursts open, launching blades at knee height. (Trigger: wall panel; DC 14 DEX; 2d6 slashing) |
| 17 | Frost Rune — A snowflake rune ignites in cold energy when stepped on. (Trigger: rune; DC 13 CON; 2d6 cold, half on save) |
| 18 | Dart Idol — A statue’s eyes conceal dart tubes, firing when the head is disturbed. (Trigger: idol tampering; DC 12 DEX; 1d4 piercing + DC 12 CON poison) |
| 19 | Falling Slab — A stone ceiling slab drops when a floor plate is pressed. (Trigger: pressure plate; DC 13 DEX; 2d6 bludgeoning) |
| 20 | Flame Circle — A glowing circle ignites underfoot, blasting fire outward. (Trigger: floor rune; DC 14 DEX; 2d8 fire, half on save) |