Create Pit

Standard Action | V, S, F | Medium
1 + 1 Round/level | Reflex negates | No
Create a 10-foot-by-10-foot extra-dimensional hole with a depth of 10 feet per two caster levels (maximum 30 feet)(Climb DC 25). When you first conjure the pit creatures must make a Reflex saving throw to avoid falling into it. Any creature ending its turn on a square adjacent
must save to avoid falling in (Reflex+2 bonus). Normal falling damage applies.