The Black Library Horus Heresy The Crimson King Collector's Edition hardcover book, written by Graham McNeill, is a highly sought after illustrated science fiction novel intended for adult readers. Set in the Warhammer Horus Heresy universe, this collector's edition features artwork by Mac Smith and Neil Roberts. The narrative, part of The Horus Heresy series, follows a thrilling story within the bustling galaxy of the Imperium of Man, making it a must-have for fans and collectors of the genre.