Create a realistic 4K image of a ghostly Sarah, a 26-year-old Nigerian Igbo woman, manifesting as a pale figure in the power outage in the Fidjrossè mansion's dark hallway. She has ethereal skin, short cornrows, and wears a white robe. Her mood whispering and vengeful. The background shows blackout shadows, fans stopped, and stifling air. Sarah stands 5’5” tall, medium character size