Explosive Steam Trap

A hidden trapdoor and a desk switch rig a quiet room to erupt without warning, venting a scalding jet of pressurized steam that fills the space in an instant.

Disable DC 18 Thievery (trained) to disarm the desk switch; DC 28 (expert) to disarm the trapdoor charge

Explosive Charge [Reaction]

Routine (1 action) The trapdoor emits a jet of superheated steam. Each creature in the room must attempt a DC 28 Fortitude save.

Critical Success The creature is unaffected.

Success The creature takes 1d10+3 fire damage.

Level 7 · Complexity Complex

Stealth DC 20 (trained) — (trained) to find the desk switch; DC 28 (expert) to find the trapdoor and charge

Disable

• Thievery DC 18 (trained) — to disarm the desk switch
• DC 28 (expert) — (expert) to disarm the trapdoor charge

AC 25

HP 50 · Hardness 8

Immunities critical hits, object immunities, precision damage

Trigger The desk switch is pressed or the trapdoor is opened

Effect The charge on the door explodes. All creatures within 10 feet take 2d10+6 fire damage, 1d10+3 piercing damage, and 1d6 persistent bleed damage (DC 22 basic Reflex save). The room is filled with steam, making all creatures within the room concealed. The trap then rolls initiative.