The Adepta Sororitas, also known as the Sisters of Battle, are a militant order of devout warrior-nuns in the Warhammer 40k universe, dedicated to the worship of the God-Emperor and the defense of the Imperium. Armed with faith, bolters, and flamers, they wage holy wars against heretics, mutants, and xenos, believing that their unshakable zeal and purity of purpose make them instruments of the Emperor's divine will.