Tidal Burst

A shining ball of water shoots from you to a point you choose within range and then bursts in a forceful wave of water. Each creature in a 20-foot-radius Sphere centered on that point makes a Dexterity saving throw, taking 8d6 Bludgeoning damage on a failed save and the creature is move to the closest edge of the sphere, on a successful save they take half as much damage.

On a failed save, if a creature runs into an object on the way to the edge they stop moving and take an additional die of damage per 5 feet remaining.

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 3.