Aclyone Crashing Wave

You conjure up a wave of water that crashes down on an area within range. The area can be up to 60 feet long, up to 20 feet wide, and up to 20 feet tall. Each creature in that area must make a strength saving throw. On a failed save, a creature takes 8d8 bludgeoning damage and 2d8 of cold damage and is knocked prone. On a successful save, a creature takes half as much damage and isn’t knocked prone. The water then spreads out across the ground in all directions, extinguishing unprotected flames in its area and within 60 feet of it, and then it vanishes. Aclyone improved this spell using more rare ingredients