From Pathfinder Adventure: Crown of the Kobold King, which isn't enabled.

Obscured Pitfalls

HAZARD 2

Stealth +8 Either DC 18 or 0 if the eyes covering an area that obscures a pitfall are destroyed.

Description A layer of disembodied eyes obscures a pitfall in the floor that's either deep enough for a human to fall into, or narrow enough to cause a painful fall.

Disable This hazard can't be disabled, merely avoided.

Pitfall

Trigger A creature walks into a large pit's square;

Effect The triggering creature falls into the pit but can attempt a DC 18 Reflex save to Grab an Edge to avoid falling. On a failure, a creature falls 20 feet into an eye-filled pit. The eyes cushion the fall so the 20-foot fall inflicts only 5 bludgeoning damage, but they also completely obscure vision; a character is effectively blind as long as they remain in the pit. The walls of the pit are slick, though a character can Climb them with a successful DC 25 Athletics check.

Trip

Trigger A creature walks into a small pit's square

Effect The triggering creature must succeed at a DC 18 Reflex save or fall Prone (on a critical failure, the creature also twists its ankle and becomes Clumsy 1 until it receives any amount of healing).

Pathfinder Adventure: Crown of the Kobold KingOGL