(Reprinting from over a month ago...)
The sound of dripping water echoes through this chamber. On the north side of the room, a nearly ten-foot-tall visage of a woman’s face is carved into the wall. Trickles of water run down her cheeks like tears into a foul and polluted reservoir below, which itself drains to a large pool of fetid black water on the south side of the room.
The depiction on the wall is Pharasma, goddess of birth, death, and fate. You also seem to recall that people talk about a burial shrine dedicated to Pharasma that was lost in an earthquake several decades ago. Given the ossuary you've already seen, perhaps this is that shrine.