A highly detailed 8k ultra realistic depiction of a terrifying demon resembling the Night King from Game of Thrones, envisioned by George R. R. Martin. The full body is encased in intricate armor featuring glowing purple and blue neon highlights, with ornate patterns that evoke a sense of otherworldly power and mystery. Bathed in dramatic, cinematic lighting, this hyperrealistic portrayal captures every nuance with unreal engine 5 precision, showcasing high details that are trending on artstation. Set in a 4k resolution with a focused composition, the scene strikes a balance between fantasy and horror, drawing viewers into a breathtaking visual experience.