After returning from Calth and the Underworld War, Sergeant Aeonid Thiel is summoned before his primarch Roboute Guilliman. Read it because One of the great things about the Horus Heresy series is learning about the characters and events that shaped the 41st millennium, and few heroes are more pivotal than these two: Sergeant Aeonid Thiel and Rouboute Guilliman, Primarch of the Ultramarines. As well as these iconic heroes, in this audio, we also see the beginnings of what will become one of the most important books in the galaxy.