acid bubbles

Choose a 5 ft area within range. You create a floating bubble of acid that fills the area, and begins to slowly float away. At the beginning of each turn, until the bubble touches a target, it drifts 10 feet in a direction you choose. When the bubble touches a target, they must make a Dexterity saving throw. On a fail, the target takes 3d6 acid damage, or half as much on a failure.

At Higher Levels. When you cast this spell using a spell slot of 2nd-level or higher, you create an additional bubble that does 3d6 acid damage. You can choose to have each bubble float in different directions.