Caustic Bubble

Pick a point within range, a 10ft radius of bubbling, toxic, green acid emerges and expands outwards from the point, hissing. Each creature within the radius must make a Dexterity Saving Throw. On a failure, taking 3d8 acid damage and have their AC reduced by 1d4 until the start of your next turn. On a successful save, the creature takes half damage and does not have its AC reduced.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd.