Create a full-body illustration of a devout Sister of Battle in an action scene, featuring a beautiful woman with sci-fi nun armor standing before a stained glass window. Her symmetrical face is detailed, with reflective eyes, dark eyebrows, and subtle makeup. The environment includes marble walls and dust particles, enhanced by intricate lighting effects such as rim lighting, dramatic lighting, and chiaroscuro from above. The scene is depicted in a professional majestic impressionistic style reminiscent of Waterhouse, John Constable, and the artistry of Studio Ghibli, Jeremy Mann, and Greg Manchess, capturing the essence of Warhammer 40k. The artwork should have the high detail and intrigue of trending pieces on ArtStation and CGSociety, with influences from Makoto Shinkai. The steel medieval armor is intricately detailed, and the scene embodies an epic, immersive atmosphere.