Acid Swamp

You transform a normal body of water into a pool of thick, bubbling acid. The spell affects an area up to 100 ft. by 100 feet by 20 feet deep. The acid is black and opaque and reeks of sulfur. Anyone splashed by the acid takes 2d6 acid damage. A creature that starts its turn in the acid or that enters the acid takes 10d6 acid damage, or half damage with a successful Constitution saving throw.