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 in 30 foot radius and 30 feet high. Creatures standing on top of the furrow as it passed underfoot must succeed on a DEX saving throw or be knocked prone. Creatures in the area of the eruption take 7d6 bludgeoning damage and are knocked prone or take half damage and are not knocked prone with a successful DEX saving throw.