pf2e.fyi
From Pathfinder Bounty #19: Grim Tidings, which isn't enabled.

Falling Tree

HAZARD 4
ENVIRONMENTAL
Stealth +15 (trained)
Description A partially sawn tree collapses onto the path.
Disable DC 21 Nature (trained) to predict and avoid the tree's collapse location or DC 21 Thievery (trained) to prop it up.
Timber!
Trigger A living creature enters the area of collapse
Effect The tree falls over, dealing 4d8+10 bludgeoning damage to all creatures in the area (DC 22 basic Reflex).
Pathfinder Bounty #19: Grim TidingsOGL