Earthburst

You touch the ground and send a furrow of displaced earth 5 feet wide toward a point you can see. Upon reaching the target point, the earth erupts in a cylinder 30 feet in radius and 30 feet high. Creatures that were standing on top of the furrow as it passed underfoot are knocked prone unless they make successful Dexterity saving throws. Creatures in the area of the eruption take 7d12 bludgeoning damage and are knocked prone, or take half damage and are not knocked prone with a successful Dexterity saving throw.

Enhancement: For each spell slot used higher than 4th level, the spell does an additional 1d12 damage.