“The Emperor is our Father and our Guardian, but we must also Guard the Emperor.” — Teachings of the Adepta Sororitas.
The Adepta Sororitas, colloquially called the “Sisterhood,” whose military arm is also known as the Sisters of Battle and formerly as the Daughters of the Emperor, are an all-female division of the Imperium of Man’s state church known as the Ecclesiarchy or, more formally, as the Adeptus Ministorum.
The Sisterhood’s Orders Militant serve as the Ecclesiarchy’s armed forces, mercilessly rooting out spiritual corruption and heresy within Humanity and every organisation of the Adeptus Terra.
