Create a highly detailed, 8k panorama shot of a dieselpunk robot, inspired by Charles Fremont Conner's style, wearing a full-body purple cloak and heavy armor, with a refined face and muzzle, holding a sword. Incorporate dark paint and design elements reminiscent of Alphonse Mucha's art nouveau style, using Unreal Engine. Ensure the image is symmetrical and features the robot in a powerful, warrior-like pose.