Warhammer
Sister Demelia

425
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.
There is naturally some overlap between the duties of the Sisterhood and the Imperial Inquisition; for this reason, although the Inquisition and the Sisterhood remain entirely separate organisations, the Orders Militant of the Adepta Sororitas also act as the Chamber Militant of the Inquisition's Ordo Hereticus.
The Adepta Sororitas and the Sisters of Battle are commonly regarded as the same organisation, but the latter title technically refers only to the Orders Militant of the Adepta Sororitas, the best-known part of the organisation to the Imperial public.
The Sisterhood serves as the Ministorum's only official military force because the Decree Passive laid down by the reformist Ecclesiarch Sebastian Thor held that in the wake of the Age of Apostasy's Reign of Blood in the 36th Millennium, the Ecclesiarchy cannot maintain any "men under arms."
The Adepta Sororitas, also known as the Sisters of Battle, are an elite sisterhood of warriors raised from infancy to adore and worship the Emperor of Mankind. Their fanatical devotion and unwavering spiritual purity is a bulwark against corruption, heresy and alien attack, and once battle has been joined they will stop at nothing until their enemies are utterly crushed.
Battle-Sisters will stride through fire if need be, their bolters spitting staccato bursts of destruction every step of the way. Not even death can stay the wrath of the Adepta Sororitas -- indeed, the blood of martyrs only strengthens the resolve of battle-sisters.