pf2e.fyi
From Pathfinder Society Scenario #3-02: The East Hill Haunting, which isn't enabled.

Eloise's Last Gasp (3-4)

COMPLEX HAZARD 5
Stealth +13 (trained)
Description An obscuring fog covers the entirety of the hallway and northern room of the manor's second floor. Anyone moving through the area is subjected to an attack from a ghostly assailant.

Disable DC 23 Acrobatics to maneuver through the fog, DC 21 Religion to ward off the spirit, or DC 23 Stealth to move through the fog without attracting attention. Disabling the haunt requires two successful checks, and each attempt takes two actions.


Gaseous Sludge

The area of the haunt is difficult terrain.

Spectral Stab (fear, occult, void)
Trigger A creature enters the haunt's area

Effect A spectral figure manifests in the fog adjacent to the target and makes a spectral touch Strike against the creature. The haunt rolls initiative.
Melee Spectral Touch +15, Damage 2d8+7 void
Routine (2 actions) The haunt uses an action to manifest an illusory shadow beside a creature ending its move in the fog, then attempts a spectral touch Strike against that creature. The shadow disappears after the Strike.
Reset The haunt lasts until disabled. It re-forms after 1 hour unless Eloise's ghost is put to permanent rest.
Pathfinder Society Scenario #3-02: The East Hill HauntingOGL