From Pathfinder #175: Broken Tusk Moon, which isn't enabled.

Acid Strongbox Trap

HAZARD 4

Stealth +12 (trained)

Description An invisible magic field around the strongbox releases a spray of acid when disturbed.

Disable DC 22 Thievery (expert) to harmlessly bleed away the magical field or Dispel Magic (2nd rank; counteract DC 20) to dispel it.

AC 10

HP 10 (BT 5)

Acidic Spray (acid, arcane)

Trigger A creature touches the strongbox directly or with a held tool

Effect The trap deals 4d8+10 acid damage in a 15-foot cone in the direction of the triggering creature (DC 21 basic Reflex).

Pathfinder #175: Broken Tusk MoonOGL