pf2e.fyi
From Pathfinder Society Special #3-98: Expedition Into Pallid Peril, which isn't enabled.

Carved Mourner

HAZARD 1
Stealth +10 (trained)
Description The carving weeps. Its tears turn to a mist that covers the halls.

Disable DC 17 Religion (trained) to recite prayers for the dead, or DC 14 Dwarven Lore to speak the history of Raseri Kanton, or DC 20 Thievery to plug the holes in the carving

AC 16; Fort +10, Ref +4
Hardness 6, HP 24 (BT 12)

Weep for Raseri Kanton (void)
Trigger A creature looks at the carved mourner

Effect The hallways fill with a thick mist. When the mist first appears, all living creatures in area A take 1d6 void damage (DC 17 basic Fortitude save), and all undead creatures regain 1d6 healing Hit Points. All creatures within the mist become Concealed. This mist lasts for 1 hour or until the haunt is disabled.
Reset 1 hour
Pathfinder Society Special #3-98: Expedition Into Pallid PerilOGL