Tiny Bubbles

Drinking this pink, bitter-tasting potion, causes hundreds of small, iridescent bubbles to emerge from your nose and mouth and fill a 20-foot cube that you can see within 30 feet of you. If the bubbles are left untouched, they float in place, remaining there for 1 hour. When a creature enters a space occupied by the bubbles for the first time on a turn, it must make a DC 13 Dexterity saving throw. On a failed save, a cacophony of popping erupts as the bubbles burst, dealing 1d6 thunder damage to all creatures inside the cube. The sound of the bubbles popping can be heard from a mile away.