Borrow the True Name

4th-level enchantment

Casting Time: 1 Action
Range: 60 feet
Components: V, S
Duration: Concentration, up to 1 minute

Choose one creature whose true or personally accepted name you know.

It must make a Charisma saving throw.

On a failed save, you temporarily seize symbolic authority over its name.

For the duration:

• the creature subtracts 1d4 from saving throws against your Warlock spells;
• it cannot benefit from Advantage on saving throws against Charm or Illusion effects from you;
• and you always know its direction while it remains within 1 mile and on the same plane.

At the end of each of its turns, the creature may repeat the saving throw, ending the spell on a success.