Tidal Surge

By calling on the gods of Sea and Storm, you harness their power to unleash natures tidal energe into a swirling mass of a tidal storm. Each creature in a 20-foot Cube originating from you makes a Constitution saving throw to weather the damage of the punishing water. On a failed save, a creature takes 5d8 force damage and is pushed 10-40 (D4x10) feet away from the source of the spell. On a successful save, a creature takes half as much damage only.

In addition, unsecured objects that are entirely within the Cube are pushed 10-40  feet away from you, and the sound of slamming waves is audible within 300 feet.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 5th.