From Pathfinder Society Scenario #6-13: All That Glitters, which isn't enabled.

Spiders' Hunting Pit

HAZARD 3

Stealth +13

Description Loose debris covers a patch of what appears as solid ground in a 10 feet by 5 feet area. It's actually covering thin webbing strung over a 20 foot pit.

Disable DC 18 Thievery (trained) to deconstruct the webbing or DC 20 Acrobatics to pull the webbing apart without getting trapped or hit by rocks.

AC 16

HP 45 (BT 22); Immunities critical hits, precision

Pitfall

Trigger A creature that isn't a spider walks onto the webbing

Effect The triggering creature falls in, taking 2d10+13 bludgeoning damage with a DC 20 basic Reflex save from rocks tumbling into the pit.

Reset 1 week

Pathfinder Society Scenario #6-13: All That GlittersORC