You accelerate the forces of decay on all undead creatures within range. Each must make a Constitution saving throw. Each undead in darkness makes its saving throw with advantage. Each undead in bright light makes its saving throw with disadvantage. Each undead with a challenge rating of 2 or higher automatically succeeds on its save. On a failed save, the undead is destroyed, decaying into a pile of harmless green mold. On a successful save, the undead can’t take bonus actions or reactions until the start of your next turn.

At Higher Levels: When you cast this spell using a spell slot of 5th level or higher, increase the minimum challenge rating required to automatically succeed on the saving throw by 1 per slot level above 4th.