You create a shallow extradimensional hole perfectly sized to trip anyone who steps within it. This hole occupies a single 5-foot square with a depth of six inches. Any Creature occupying the square when you first create the hole, or who later steps into the square containing the hole, must make a Reflex Saving Throw to avoid falling prone in an adjacent square and taking 1d6 points of Damage. A Creature that makes its Saving Throw still stumbles ever so slightly and takes a –1 Penalty on all rolls and checks for 1 round. The spell has no effect on creatures adjacent to the square containing the hole.