Fifteenth Legion of Magnus the Red — scholar-psykers betrayed by Prospero's burning. Tzeentch's Rubric bound their souls to armour of dust.
Books
Cassern S. GotoDawn of War
Graham McNeillHorus Heresy
10 Dan AbnettHorus Heresy
Rob SandersTime of Ending: Chronology
Chris WraightSpace Marine Battles
Various AuthorsHorus Heresy
Time of Ending: Chronology
Graham McNeillPrimarchs of Horus Heresy
Graham McNeillHorus Heresy
Graham McNeillSiege of Terra
Dark Imperium: Chronology
Chris WraightThe Horus Heresy: Chronology
Chris WraightThe Horus Heresy: Chronology
Chris WraightThe Horus Heresy: Chronology