In the third of Black Library’s Horus Heresy Primarchs series, Graham McNeill’s Magnus The Red: Master of Prospero, we’re transported to a time not long after Magnus and his sons were first brought together on Prospero. On the doomed Imperial world of Morningstar, Magnus and his brother Perturabo lead their Legions in an attempt to rescue as many civilians as possible before the planet tears itself apart. While Perturabo and the Iron Warriors focus on the logistics of the mission, Magnus and his Thousand Sons are more concerned with searching for answers as to what’s happening on Morningstar, and why.
