Bubble Blast

You summon 3 rainbow-colored bubbles the size of water melons that float gently around a point within 60 feet of you. On your turn, you can use a bonus action to move one of these bubbles 20 ft in any direction. If it moves into the same space a creature that creature and all creatures within a 5 ft radius of the bubble must make a Dexterity saving throw against your Spell Save DC. On a success, the creature(s) suffers half damage. On a failure, the creature(s) suffer(s) 3d8 force damage and is(are) knocked prone.