A powerful sister of battle stands resolute in front of a vibrant stained glass window, her detailed symmetrical face illuminated by dramatic chiaroscuro lighting. Her reflective eyes and dark eyebrows emphasize her devotion, enhanced by subtle makeup. Clad in intricately designed sci-fi nun armor reminiscent of Warhammer 40k, she exudes strength and grace. The marble walls around her are lightly dusted, with particles dancing in the detailed lighting. The scene is painted in a majestic impressionist style inspired by Waterhouse, Constable, and Studio Ghibli artists like Makoto Shinkai, all lending to a masterpiece trending on ArtStation and CGSociety. Her steel medieval armor gleams, capturing the essence of a bygone era merged with futuristic elements. The scene is depicted with high detail and intricate features, avoiding any imperfections or unrealistic elements, showcasing a singular character in a moment of epic action and serene beauty.