“I know a great many secrets indeed, if it is answers you seek, perhaps we can come to … an agreement.”- Traditional acceptance of a Fiendish Pact.
The Archfey- Your patron is a creature of legend who holds long forgotten secrets.
The Fiend- Your patron is a fiend from the lower planes of existence.
The Great Old One- Your patron is a mysterious entity, whose nature is utterly foreign.
Possible Training or Faction Ties