You lob an acid bubble. Choose a point within range that you do not have to see, but needs to be unobscured by terrain, so the bubble being lobbed can land at that point (think of it like a grenade being thrown).  Every creature within 5ft of the point must succeed on a Dexterity saving throw or take 1d6 acid damage.  

This spell’s damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).