Deathly Wail

Your magic transforms your voice into the cry of a banshee. Each creature of your choice in a 15-foot Emanation originating from you that can hear you must make a Constitution saving throw. On a failed save, a creature that has 25 Hit Points or fewer drops to 0 Hit Points. A creature with more than 25 Hit Points instead takes 6d8 Psychic damage. On a successful save, a creature takes half as much Psychic damage, regardless of its current Hit Points.

Using a Higher-Level Spell Slot. The damage increases by 1d8, and the Hit Point threshold increases by 5, for each spell slot level above 5.