True Name

You target a celestial, fey, fiend, or other creature within range that has a hidden true name. That creature must make a Charisma saving throw. On a failure, you learn that creature’s true name.

At the same time, you must make an Intelligence saving throw equal to 8 + the total of the creature’s Intelligence, Wisdom, and Charisma attribute modifiers. If you fail, the creature you targeted learns your name and appearance.