Peace of Mind

With practice, you became able to shield you mind and thoughts from outside threats, making it harder for some type of spells to affect you. You gain advantage when you roll a saving throw against a mind impairing effect spells or abilities. In a case of a failure, you suffer the normal effect of the spell / ability, but the damage, if there is any, is halved. On a success, the spell / ability has no effect.

Mind impairing spells include any spell that require a Intelligence, Wisdom or Charisma Saving throw.