"Echoes of the psychic scream were heard across the entire Imperium. Scores of astropathic choirs felt a terrifying power emanating from a single point in the Warp. The minds of many sanctioned psykers who had been tasked with listening for whispers of the Thousand Sons were devoured in an instant, and from their ruptured bodies arose cackling Tzeentchian daemons. Only nine survived to tell of what they saw." —On the Rubric of Ahriman from the Grimoire Hereticus The Rubric of Ahriman was the nam