Casting Time 1 standard action
This spell functions as create pit, except that the pit has the ability to squeeze and crush any creature trapped within it and has a maximum depth of 100 feet. Creatures who fall into the hole take falling damage as normal. In addition, anyone within the pit, not just those on the bottom, takes 4d6 points of bludgeoning damage each round as the pit contracts and then returns to its normal size (a successful Reflex save halves this damage). The ever-shifting walls of the pit are quite difficult to scale and have a Climb DC of 35.
Pathfinder Roleplaying Game Bestiary 2, © 2010, Paizo Publishing, LLC; Authors Wolfgang Baur, Jason Bulmahn, Adam Daigle, Graeme Davis, Crystal Frasier, Joshua J. Frost, Tim Hitchcock, Brandon Hodge, James Jacobs, Steve Kenson, Hal MacLean, Martin Mason, Rob McCreary, Erik Mona, Jason Nelson, Patrick Renie, Sean K Reynolds, F. Wesley Schneider, Owen K.C. Stephens, James L. Sutter, Russ Taylor, and Greg A. Vaughan, based on material by Jonathan Tweet, Monte Cook, and Skip Williams.