No player may control duplicates of a unique character or cause them to fight each other. This includes unique characters in play, in battle, in a side battle, face down, or in a set-aside area. Character cards with the same card title and the same art or with the same title and the same brigade are considered duplicates for deck building purposes. A player may have only control one of these at any time. The only exception to this rule is non-unique characters with different card art.
Some character cards have different card titles, but are the same character. A player may have only one of these in your territory, in battle, in a side battle, face down, or set-aside at a time:
• Whore of Babylon or Babylon the Great, Morg or Morgan, Saul/Paul (as Saul) or Saul/Paul (as Paul), Esau or Esau the Hunter
All Artifact, Covenant, Curse, and Fortress cards are considered unique. A player may control only one of these at any time.