sister_of_battle

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The Sisters of Battle and the Adepta Sororitas are essentially the same thing. Just like how the Space Marines and the Adeptus Astartes or the Imperial Guard and the Astra Militarum are the same thing. The Adepta Sororitas is the official name for the Sisters of Battle, and the Adeptus Astartes is the official name for the Space Marines.

What happened was about ten years ago Games Workshop (the makers of Warhammer 40k) lost an intellectual property lawsuit against Chapterhouse Studios in which it was ruled that names like Space Marines were too generic for Games Workshop to trademark [1]. As a result, Games Workshop renamed everything to make their properties trademarkable.

(Lore-wise, the Sisters of Battle are technically the military branch of the larger organization known as the Adepta Sororitas [2], but for Danbooru purposes it doesn't really matter.)

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