Earthen Vortex

A swirling mass of rock and stone whips up on a point that you can see on the ground within range. The vortex is a 10-foot-radius, 10-foot-high cylinder centered on that point. Until the spell ends, you can use your action to move the vortex up to 10 feet in any direction along the ground. A creature must make a Dexterity saving throw the first time on a turn turn that it enters the vortex or that the vortex enters its space, including when the vortex first appears. A creature takes 10d8 bludgeoning damage on a failed save, or half as much damage on a successful one. The area of the vortex becomes difficult terrain during and after the spell ends.