Blasphemy

As an action, you touch a paladin or cleric and force them to commit a heretical act against their deity. This act can be anything as long as it directly violates the commandments of the target's deity. The target must make a Charisma saving throw. On a failed save, the target takes 1d12 psychic damage and is forced to do something that is viewed as blasphemy by their deity. They take 1d6 psychic damage on a successful save.

If this spell causes a paladin to break their oath, the caster takes 2d8 psychic damage and cannot cast this spell again for the next week.