pf2e.fyi
From Pathfinder #207: The Resurrection Flood, which isn't enabled.

Stonegutter Mold

HAZARD 7
Stealth +17 (trained)
Description A hardy, innocuous-looking green mold grows over surfaces, slowly absorbing minerals.

Disable DC 26 Survival (trained) to scrape away the mold without touching it

AC 22; Fort +19, Ref +12
HP 80 (BT 40); Immunities critical hits, precision; Weaknesses fire 10

Calcium Consumption
Trigger A creature with bones touches the mold or steps into an area covered with it

Effect The mold shudders and slithers onto the triggering creature as it attempts to absorb calcium through their skin. The creature attempts a DC 25 Fortitude save.

Critical Success The target shakes the mold off and is unaffected.

Success A small patch of mold clings to the target and deals 2d10+9 piercing damage.

Failure The mold clings to the target. The target takes 4d10+18 piercing damage and is Drained 1.

Critical Failure The mold envelops the target. As failure, except the target is also Slowed 1 until it's healed to its Hit Point maximum.

Note: A DC was not provided for this ability by Paizo. The DC present here is a hard DC for the hazard level according to the GM Core hazard building Tables.

Reset 1 hour, as the mold settles back across the surface.
Pathfinder #207: The Resurrection FloodORC