A highly detailed and ultra-realistic depiction of a menacing demon reminiscent of the Night King from Game of Thrones, inspired by the works of George R. R. Martin. This full-body portrayal showcases the demon in intricately detailed armor, a fusion of purple and blue neon elements that pulsate with an otherworldly glow. The armor is ornate, with elaborate patterns that suggest an ancient and powerful lineage. The scene is illuminated with dramatic, cinematic lighting that enhances the fierce and terrifying presence of the figure. Shot in 4k with Unreal Engine 5, the image captures hyperrealistic details, trending on ArtStation, with a sharp focus on the intricate textures and expressions. The setting accentuates a mystical and dangerous aura, casting shadows that dance with the neon armor's light, creating a haunting, memorable visage.