Create a detailed and dynamic illustration of a dark-skinned Arab woman as a Sister of Battle, (Adepta Sororitas), from the Warhammer 40, 000 universe. She should be depicted in her iconic power armor, wielding a bolter and a flamer, embodying fierce devotion and unyielding faith. The background should evoke a grimdark sci-fi battlefield with gothic architecture and war-torn environment. Emphasize her role as a holy warrior fighting for the Emperor, showcasing both strength and piety.