Passive: gain a +1 to all Charisma based checks, and another +1 for every four levels you have.

You have 1 point of Conquerors Haki a day for every four levels you have. At Con 20: Once a week you may Overwhelming Willpower.

Overwhelming Willpower: Spend an action and 3 points of Conquerors Haki to attempt to intimidate any creature within a 30 foot radius. They will have to make a Con saving throw equal to 10+Con+1 for every two levels. If any creature in the radius fails, the creatures affected are frightened. If they fail by 10 or more, they are knocked unconscious until they can beat the saving throw.