Each creature within 60 feet of the dragon and that can hear it must succeed on a DC 18 Constitution saving throw or be deafened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Deafening Roar for the next 24 hours.