Sister Superior D'Arc was born on a Hive World and joined the Adepta Sororitas at a young age. During the Second War for Armageddon, she led her squad after her commanding Superior was slain, claiming divine guidance. Under her leadership, the squad achieved several important victories that paved the way for her to become a saint. She now leads an elite squad of Sisters of Battle as a unique infantry unit for the Adepta Sororitas, who serve as the Ecclesiarchy's only official military forces.