Balefire

A bar of light shoots from your hand on a line 60 feet long and 5 feet wide in a direction you choose. Each creature in the line must make a Dexterity saving throw. A creature takes 40d6 radiant damage on a failed save, or half as much damage on a successful one.

Any creature brought to 0 hit points by this spell dies instantly, and is unmade from reality. All damage and effects caused by this creature in the last round of combat are unmade.