Darius is a friend of your urb and everyone else. He has the highest reputation in the city. If you have the reputation and style to get into every club in every venue, you'll get a power social by him. Once you've used the power social on the villians (either Harry Snivel, Kiki Blunt or Urangoo McBain) the villians will give you a part to Darius' Secret Machine at his penthouse.