Thunderbelch

Upon ingesting this fiercely fizzing potion, roll a d4 to determine the number of rounds before you let forth a thunderous belch of epic proportions. On your turn that round, you must use your action to release the belch. Each creature other than you within 10 feet of you must make a DC 14 Constitution saving throw. On a failed save, a creature takes 3d8 thunder damage and is deafened until the end of your next turn. On a successful save, the creature takes half as much damage and isn't deafened.