You create a 10-foot-by-10-foot extradimensional hole with a depth of 10 feet per two caster levels (maximum 50 feet). You must create the pit on a horizontal surface of sufficient size. Since it extends into another dimension, the pit has no weight and does not otherwise displace the original underlying material. You can create the pit in the deck of a ship as easily as in a dungeon floor or the ground of a forest. Any Creature standing in the area where you first conjured the pit must make a Reflex Saving Throw to jump to safety in the nearest open space. In addition, the edges of the pit are sloped, and any Creature ending its turn on a square adjacent to the pit must make a Reflex Saving Throw with a +2 bonus to avoid falling into it. Creatures subjected to an effect intended to push them into the pit (such as bull rush) do not get a Saving Throw to avoid falling in if they are affected by the pushing effect.

Creatures who fall into the pit take falling Damage as normal. Creatures who fall into the pit take falling Damage as normal, plus 2d6 points of piercing Damage from the spikes. Any Creature or object coming into contact with the spikes along the walls, such as a Creature trying to climb out, or rope or other typical aids to climbing, takes 1d6 points of piercing Damage each round they are in contact with the walls. For those willing to accept the Damage incurred while climbing, the pit's walls have a Climb DC of 20. 

When the Duration of the spell ends, creatures within the hole rise up with the bottom of the pit until they are standing on the surface over the course of a single round.