wallpaper portrait of a legendary phantom knight, formidable, indomitable, relentless, fierce, epic composition, digital painting, dramatic, somber, emotionally profound, volumetric lighting, intense and brooding dark hues, leaving a deep and haunting impression on the psyche, high quality, high resolution, otherworldly presence, captivating, skillfully depicted anatomy, atmospheric, devoid of clutter, no text or signatures, pristine image quality.