Vraccas's Dragon Roar

You breathe in to the full capacity of your lungs and then scream, your voice bolstered with magic to make it sounds like a dragon's roar.This roar is audible up to 100 feet.

All the creature within reach must make a Constitution saving throw, a creature takes 4d6 thunder damage on a failed save, or half as much damage on a successful one. On a failed save the creature is also stunned for the 1 minute, at the end of each of its turns, the target can make a Constitution saving throw. On a success, the effect ends.

At Higher Levels. When you cast this spell using a spell slot of 3th level or higher, the damage increases by 1d6 for each slot level above 2nd.