A full body portrait of a dark sovereign in a fantasy underworld, exuding a seductive yet sinister aura. Her crimson eyes glint with an enigmatic power, framed by long, flowing grey hair that cascades down her shoulders. She wears an intricate, shadowy gown adorned with mystical symbols and intricate embroidery, blending seamlessly with her dark tattoos that seem to writhe and pulse with arcane energy. The background is a swirling tapestry of dimly lit caverns and ethereal mist, enhancing the ambiance of a nether realm. The scene is imbued with a dark, cinematic color grading, enhancing the ethereal quality of the illustration, capturing the essence of a deviant art masterpiece with an 8k cinematic effect.