Aqua Repulsion

You unleash a wave of water that bursts outward from you in a radius of 20 feet. Creatures in the area must make a Strength saving throw or take 6d6 bludgeoning damage and are pushed to the edge of the radius. If their path is blocked and they cannot reach the full 20 feet (for example, they would move into a wall or another creature), they are pushed to the nearest space and take an additional 2d6 bludgeoning damage and are knocked prone. On a successful save, they take half as much damage and are not pushed.