A highly detailed and ultra-realistic depiction of a chilling demon inspired by the Night King from Game of Thrones by George R. R. Martin, showcasing a full-body view. The demon is adorned in complex and intricate armor with shades of purple and blue glowing neon, enhancing its formidable presence. The armor is ornate, with a mix of ancient runes and modern elements. The scene is captured under dramatic, cinematic lighting that adds depth and intensity. This high-definition 4k image displays hyperrealistic details, created with Unreal Engine 5, capturing every nuance. The composition has a striking 9:16 aspect ratio, reflecting a trending art piece likely to be featured on ArtStation.