From Pathfinder Adventure: Malevolence, which isn't enabled.

Xarwin Caul

HAZARD 10

Stealth +25 (Master)

Description The Caul is a thin layer of transparent, moist webbing clinging to the manor's exterior surfaces. The stuff feels slippery and unnaturally cold to the touch, and it clings and stretches when a finger or other object used to touch the Caul is pulled away.

Disable DC 32 Occultism (master) or DC 34 Religion (expert) to exorcise the caul

AC 30; Fort +22, Ref +16, Will +24

Hardness 18, HP 70 (BT 35); Immunities precision, critical hits; Weaknesses vitality 10

Burst of Hatrid (emotion, mental)

Trigger A creature opens any door or window into Xarwin Manor, or any creature or object passes through the caul from outside into the manor

Effect The caul immediately bursts like an oily bubble, vanishing in an instant of foul-smelling smoke. A wave of susurration creeps through the area, and all sapient creatures experience a sudden sensation of utter hatred toward birdlife for the span of a single heartbeat. All natural avians within a 300-foot emanation from Xarwin Manor (but not those within the manor or underground) take 15d6 mental damage (DC 33 basic Fortitude save).

Reset 1 week; putting Xarwin's ghost to rest permanently destroys the haunt.

Pathfinder Adventure: MalevolenceOGL