Brineruin

Seawater spews forth from your mouth, seeping into the ground like hundreds of wriggling snakes before a geyser of salty water explodes out of the earth from a point of your choosing. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 7d6 bludgeoning damage on a failed save, or half as much damage on a successful one.

Any creature that fails its saving throw is knocked prone.

The geyser spreads around corners and in a manner almost alive, seeks out any within range regardless of cover. Douses all sources of flame-based light in the area.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6, and the radius of the spell is increased by 5 ft. for each slot level above 3rd.