You call forth a line of rumbling earth that extends from you in a straight line up to 30 feet long and 10 feet wide. Each creature in the line must make a Dexterity saving throw, taking 5d8 bludgeoning damage on a failed save, or half as much damage on a successful one. Creatures that fail the saving throw are also knocked prone. In addition, if the ground in that area is loose earth or stone, the ground in the area becomes difficult terrain until cleared.