Twentieth Legion of the twin primarchs Alpharius and Omegon — masters of infiltration and lies, their loyalty a hydra-tangle only they understand.
Books
Cassern S. GotoDawn of War
Dan AbnettHorus Heresy
Gav ThorpeHorus Heresy
John FrenchThe Horus Heresy: Chronology
Various AuthorsHorus Heresy
Rob SandersThe Horus Heresy: Chronology
Graham McNeillThe Horus Heresy: Chronology
John FrenchHorus Heresy
Various AuthorsHorus Heresy
Various AuthorsHorus Heresy
Laurie GouldingHorus Heresy
Mike BrooksPrimarchs of Horus Heresy
Rob SandersThe Horus Heresy: Chronology