Create a highly detailed, 8k resolution fantasy illustration of a Raypunk-robot with a sword, set in a shadowy city. Incorporate a mix of realistic and intricate details, with a focus on the robot's headsculpt and brandishing halberd. The image should evoke a sense of Pandemonium, with bright sparks and a sense of movement. Use a style inspired by Alphonse Mucha and Greg Rutkowski, with a key art aesthetic. Ensure the image is award-winning quality, suitable for display on Artstation and Amiami.