Crematory Blast CR 9
Source: Pathfinder #11.
Notice Perception DC 20 (to notice tendrils of smoke rising from each of the huge ovens); hp 18
Trigger proximity; Reset automatic (1 hour)
A sudden blast of fire wells up inside of each of the three ovens, then plumes out into a sheet of flame that fills the room. As the fires burn, shrieking spirits made of flame tear through the room, swimming through the bodies of living creatures and appearing to tear away bits of flesh as they do. Every character exposed to the fires must make a DC 20 Will save to avoid being convinced the flames are real. Success indicates that the haunt deals no damage, but failure results in a PC taking 10d6 points of fire damage. At the end of the round, the fire vanishes (leaving behind the creatures—see below), but only those creatures who took fire damage appear burned. Other creatures (and the contents of the room) are unscathed.