Dissonant Shatter

You unleash the power of the dissonant music. You focus it into a hideous noise that cripples and destroys the mind of anything nearby. 

Each creature of your choice within 200 feet is effected. All creatures must make a wisdom saving throw. Any creature within 30 feet automatically fails. Creatures between 30 and 60 feet roll normally. Any creature from 60 to 100 feet has advantage on their roll. All creatures beyond that take half damage and have advantage on their roll. On a failed save, a target takes 10d6 psychic damage, 10d6 force damage, and 10d6 bludgeoning damage, and is stunned for 30 seconds. On a successful save, a target takes half as much damage and isn’t stunned. For every creature that is killed, you gain a 1d4 of damage you can add to your next attack (10 creatures is 10d4)

A stunned target can make an Intelligence saving throw at the end of each of its turns. On a successful save, the stunning effect ends.