Graham McNeill
A Horus Heresy novel that returns focus to the Warmaster Horus and the Sons of Horus as they pursue a campaign with deep stakes for the traitor cause. It advances Horus's own arc and his growing power, set aboard and around his flagship's wider war. An important entry best read once a reader is well into the series.
001.M31 - 014.M31
range date, medium confidence