Earth Falls (3-4)
COMPLEX HAZARD 3 +8
The area has become unstable as part of the swamp is pulled into another plane, causing sinkholes to spontaneously form.
Arcana,nature,thievery check (trained) three times to counter the planar energies.
A Pit!
A creature of size Small or larger steps into an affected square or is standing on a square that becomes a sinkhole
The ground beneath the creature gives way. The creature must attempt a DC 18 Reflex Save.
Critical Success The creature is able to move to an adjacent square.
Success The creature grabs an edge.
Failure The creature falls into the pit and lands Prone. It takes 5 bludgeoning damage. Due to roots in the pit wall, it is easy to climb out of, requiring only a DC 13 Athletics check.
(3 actions) On its turn each round, two new 10-foot-square sinkholes, 10 feet deep, randomly appear on the map. Until a creature of size Small or larger steps in the area of one, it looks no different than the surrounding area. If a creature takes an action to seek and succeeds at a DC 18 Perception check, it notices the hazardous square.
Pathfinder Society Quest #22: Friends in NeedORC