Evoke True Name

You use a brief insight and your intuition to utter the true name of a creature in range. Choose one creature in range. You treat your next Persuasion or Intimidation check against it within the duration as rolling a natural 20; if you chose Persuasion, the target is Charmed by you for the remainder of the duration, and if you chose Intimidation, the target is Frightened by you for the remainder of the duration.

The brief contact with the true name is not enough to imprint it on your mind, and after the duration it cannot be remembered or recognized except by a using this spell through the Wish spell; divine intervention can prevent you from remembering the name, even with the use of the Wish spell.