Void Release

As you drop to 0 hit points, but are not killed outright, you force a devastating shockwave from the Astral Plane into reality. All creatures within 20 feet of you must make a Dexterity saving throw. Allies within range make this save with advantage. On a failed save, a creature takes 5d10 Force damage and is stunned for one turn. On a successful save, the creature takes half damage and isn't stunned.

At Higher Levels. When you cast this spell at higher levels, for every slot level above 5th, you deal an additional 2d10 damage, the radius of the spell increases by 5 feet, the stunned condition lasts for an additional round, and you gain one level of exhaustion.