uncommon earth transmutation 

Cast [>] verbal

Area 10-foot emanation

You manipulate the earth beneath your feet to throw your enemies off balance, leaving chunks of rock and rubble behind. Creatures within range take 2d6 bludgeoning damage, with a basic Reflex save; on a failed save, they also fall prone. The affected area becomes difficult terrain, but you can move through the difficult terrain normally.

Heightened (+1) The damage increases by 1d6.

LOIL, page 224.