Acid Bath

You target a point within range, causing the ground to become spongy and heavily acidic in a 20' radius circle. Any creature in the affected area must make a Dexterity saving throw or take 4d6 acid damage. A creature who makes the saving throw takes half damage. A creature must also make the saving throw when it moves into the area for the first time on a turn, or ends it's turn there. The area of the spell becomes difficult terrain for the duration of the spell.