Student of Philosophy

You were trained in a now-defunct philosophical tradition—such as that of the now-destroyed magic universities or astrologers—and learned to use logic and reason to persuade others.
  Benefit: You can use your Intelligence modifier in place of your Charisma modifier on Diplomacy checks to persuade others and on Bluff checks to convince others that a lie is true. (This trait does not affect Diplomacy checks to gather information or Bluff checks to Feint in combat).