A hyper-detailed 8k ultra-realistic depiction of a fearsome demon reminiscent of the Night King from Game of Thrones, envisioned by George R. R. Martin. This full-body portrait showcases the demon in intricately ornate purple and blue neon armor that glows with an otherworldly light. The scene is bathed in cinematic lighting, enhancing the demon's menacing presence. The image is trending on ArtStation and rendered in 4k with Unreal Engine 5, capturing every fine detail with an uncanny focus. Subtle snowfall surrounds the demon, highlighting the chilling aura, while shadows dance across its visage, adding depth and intensity. The atmosphere conveys a spine-chilling yet captivating allure, set in a 9:16 aspect ratio, ensuring a dramatic visual experience.