pf2e.fyi
From Pathfinder Bounty #1: The Whitefang Wyrm, which isn't enabled.

Unstable Ice

HAZARD 0
ENVIRONMENTALTRAP
Stealth +5
Description The ice here is fractured due to the warming weather conditions and the inexorable flow of the ocean water below.
Disable DC 19 Athletics to move the ice sheets into a more stable position
Drift
Trigger A creature steps onto the unstable ice
Effect The weight and momentum of the creatures causes the fractured ice to shatter and separate, leaving them stranded on a floating iceberg.
Pathfinder Bounty #1: The Whitefang WyrmOGL