From Pathfinder #202: Severed at the Root, which isn't enabled.

Razor Snare

HAZARD 4

Stealth +15

Description Slender razor wire snags a creature, yanking its feet to knock it down.

Disable DC 22 Survival or DC 22 Thievery (trained) to snip the wire without getting snared

AC 21; Fort +15, Ref +8

Hardness 10, HP 40 (BT 20); Immunities critical hits, precision

Snag

Trigger A creature steps into the square with the snare tripwire

Effect The snare makes a snare Strike against the triggering creature.

Melee Snare +15, Damage 1d6 bleed plus 4d6+10 slashing

The target is Grabbed (Escape). On a critical hit, the target is also knocked Prone.

Pathfinder #202: Severed at the RootORC