Godslayer

You trained your entire life to get used to and replicate the powers of godlike creatures that you have sworn to destroy. Because of this, you are able to optimlly minimise thier damage and find thier weak points to exploit. You have advantage on attack rolls and saving throws against cr 22 or higher creatures. After defeating at least one such creature, you also gain advantage on charisma rolls against creatures who know about and can comprehend this victory.