Earthbolt

With a shout, you strike the ground at your feet and create a bolt of seismic force that causes earth, rock, and sand to fly into the air, striking creatures along its path.   Any creatures caught in the spell's area take 1d6 points of damage per caster level (maximum 10d6).   This spell functions only if you are standing on dirt, clay, sand, or stone (including stone floors), not on wooden floors or other surfaces.
 

You strike the ground at your feet and create a bolt of seismic force that causes earth, rock, and sand to fly into the air, striking creatures along its path. Each creature in a 5-foot wide, 30-foot long Line must make a Dexterity saving throw, taking 6d6 Bludgeoning damage and being knocked Prone on a failure, or half as much damage and not knocked Prone on a success.   This spell functions only if you are standing on dirt, clay, sand, or stone (including stone floors), not on wooden floors or other surfaces.   At Higher Levels. When you cast this spell using a higher level spell slot, increase the damage by 1d6 for each slot level above its base level.