Tremor

School transmutation [earth]; Level bloodrager 3, druid 3, magus 3, shaman 3, sorcerer/wizard 3, witch 3
CASTING
Casting Time 1 standard action
Components S
EFFECT
Range see text
Area 30-ft. line, 20-ft. cone-shaped spread, or 10-ft.-radius spread (see text)
Duration instantaneous
Saving Throw Reflex half (see text); Spell Resistance no
DESCRIPTION
You strike the ground and unleash a tremor of seismic force, hurling up earth, rock, and sand. You choose whether the tremor affects a 30-foot line, a 20-foot cone-shaped spread, or a 10-foot-radius spread centered on you. The space you occupy is not affected by earth tremor. The area you choose becomes dense rubble that costs 2 squares of movement to enter. Dense rubble adds 5 to the DC of Acrobatics checks and adds 5 to the DC of Stealth checks. Creatures on the ground in the area take 1d4 points of bludgeoning damage per caster level you have (maximum 10d4) or half damage on a successful save. Creatures that fail their saves are knocked prone.

This spell can be cast only on a surface of earth, sand, or stone. It has no effect if you are in a wooden or metal structure or if you are not touching the ground.