Mettaton in ghost form, floating, transparent, robotic features, heart-shaped core, box-like shape, white and pink color scheme, ethereal glow, spectral wires, hovering in haunted mansion, gothic architecture, chandeliers, cobwebs, eerie atmosphere, full-body shot, dramatic lighting, misty background, Victorian era, ornate details, high contrast, spooky, digital art style, smooth metal texture, reflective surfaces.