Lucien sucks. He killed Rose, tons of people, your dog, your spouse or spouses, and you but you come back to life. He rebuilt the Spire to revive his family but he start seeing Albion as a flawed land. He must kill the heros so he could have the wish. Garth escaped as he became mad. He thought both rose you were heros but Rose may not be a hero because she died and you survived. You or Reaver kill him matters when you kill him. If you wait a little of his speech Reaver kills him.