Divine Vulnerability

You channel divine or profane power, choosing either radiant or necrotic energy. Target one creature within range. The target must make a Constitution saving throw. On a failed save, the target becomes vulnerable to the chosen damage type until the spell ends. If the target is resistant to the chosen damage type, it makes the saving throw with advantage. If it fails, it becomes vulnerable to that damage type. Targets that are immune to the chosen damage type are unaffected by this spell.

At Higher Levels: When you cast this spell using a spell slot of 6th level or higher, you can target one additional creature for every two slot levels above 4th. The targets must be within 30 feet of each other when you target them.