Legendary ghost knight portrait as a wallpaper, showcasing a powerful, invincible, and unstoppable warrior. The composition is brutal and epic, rendered as a digital painting with dramatic and gloomy elements. It captures emotionally profound depth with volumetric lighting and intense, brooding dark tones, aiming to leave an indelible and haunting impression on the viewer's psyche. High quality and high resolution are maintained, avoiding any references to duplicated, poorly drawn anatomy or limbs, as well as any text, names, signatures, watermarks, or jpeg artifacts.