From Pathfinder #177: Burning Tundra, which isn't enabled.

Shattering Rune

HAZARD 9

Stealth +23 (master)

Description A magical rune is inscribed on the tarry earth at the entrance to the hut, buried beneath snow, with an Invisible sensor that detects creatures within a 10-foot-radius sphere.

Disable DC 30 Thievery (master) to erase the rune without triggering the sensor or Dispel Magic (5th rank; counteract DC 28) to dispel the rune

AC 10

Shattering Shockwave (arcane, sonic)

Trigger A Small or larger creature comes within 10 feet of the rune

Effect The rune unleashes a deafening peal of thunder that deals 10d8 sonic damage in a 20-foot burst (DC 30 basic Reflex).

Pathfinder #177: Burning TundraOGL