Acid Bubble

You create up to 6 one foot emerald green translucent Bubbles that flyout and float in a space for the duration of the spell. When a creature comes with in 10 feet of a bubble it pops every creature with in 20 feet of the bubble must make a dexterity saving throw on a failed save they suffer 1D4 acid damage this turn and a additional 1D4 on there next turn if they succeed they take 1D4 acid damage this turn and no additional damage the next turn. bubbles may be combined to make larger bubbles when a bubble is combined its size increases by another foot and creatures suffer 1D4 additional acid damage when the bubble pops. and another additional 1D4 the next turn on a failed save up to 5 bubbles can be combined.          

two additional bubbles are created for each spell level use above 2nd.