Acid Wave

You conjure up a wave of orange acid that crashes down on an area within range. The area can be up to 30 feet long, up to 10 feet wide, and up to 10 feet tall. Each creature in that area must make a Strength saving throw. On a failed save, a creature takes 6d8 Acid damage and is knocked prone. On a successful save, a creature takes half as much damage and isn’t knocked prone. A creature knocked prone by the spell also takes 3d8 acid damage on the next round. Any flames in the spells area are extinguished.