A stunning 8k ultra-realistic depiction of a terrifying demon inspired by the Night King from Game of Thrones, envisioned through George R. R. Martin's dark fantasy lens. The creature is clad in an intricate suit of purple and blue neon armor, exuding an ornate and otherworldly aura. The scene is illuminated with cinematic lighting, creating a dramatic and intense atmosphere. The focus is sharp and hyperrealistic, showcasing high levels of detail, rendered using Unreal Engine 5. The composition is trending on ArtStation, presented in 4k resolution with an emphasis on rich textures and vibrant contrasts, all in a striking 9:16 aspect ratio.