Acid Toy

You hurl a solid ball of acid into the air and cause it land in a spot you can see within the range.  All creatures within 10 ft. of where it lands must make a dexterity saving throw or take 2d6 acid damage.  Any creature which enters the space occupied by the ball of acid on its turn, or starts its turn there takes also takes 2d6 acid damage. 

As a bonus action on subsequent turns, you cause the ball to fly back up into the air and land in a new location up to 20 ft. away causing the same splash effect as before.  After this bonus action is used, or after the spell's duration ends, the ball of acid harmlessly evaporates.

When you cast this spell using a spell slot of 3rd level or higher, the damage caused by the spell when it deals acid damage increases by 1d6 for each slot level above 2nd.