Crashing Tide

You unleash a wave of salt water. Each creature in a 15-foot cube emanating from you makes a Constitution saving throw. On a failed save, a creature takes 2d8 cold damage and is pushed 10 feet away from you. On a successful save, a creature takes half as much damage only.

In addition, objects that are not secured, but are entirely within the Cube are pushed 10 feet away from you, and the water spray is felt for 100 feet.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 1.