Eldritch Storm

A storm of crackling energy erupts overhead, surging with the powers of the Eldritch horrors from the Void beyond.  Choose up to six creatures to make a Constitution saving throw.  Each creature takes 2d10 psychic damage and 2d10 necrotic damage and is now stunned until its next turn on a failed save; on a successful one, it takes half damage and is frightened until their next turn.  If you choose the same creature consecutively and they fail their save, they suffer one point of exhaustion.

This spell's damage increases based on caster's level.  At level 13, add 1d10 psychic and 1d10 necrotic damage. At level 17, add 2d10 psychic and 2d10 necrotic damage. At level 20, add 4d10 psychic and 4d10 necrotic damage.