Horus and the traitors

The First Heretic and Aurelian anchor Lorgar’s path. His past, Erebus and the early Word Bearers surround them; Shadow of the Past is a post-Heresy epilogue.

Horus’s rebellion begins: brotherhood dies at Isstvan and Sanguinius is drawn into a trap. Fulgrim’s path continues into Angel Exterminatus while the survivors take their own roads.

The attack on Calth, its underground war and Lorgar’s Shadow Crusade. Kor Phaeron’s defeat continues in Macragge’s Honour and Children of Sicarus.

The Warmaster’s middle campaigns and Vengeful Spirit lead into Russ’s attack and Slaves to Darkness, alongside his allies and other journeys towards Terra.

Betrayer brings together Angron, Lorgar and the devastation of Ultramar, with Angron’s Nucerian past, the Butcher’s Nails and Khârn’s stories alongside it.

The early Death Guard, Galaspar and Mortarion’s choices during the Heresy. The Buried Dagger completes the Legion’s fall; Grandfather’s Gift explores the aftermath.

Perturabo’s past and Olympia’s rebellion lead into Phall, Iydris and Tallarn. These Iron Warriors campaigns are separate paths, not one continuous battle.

Prince of Crows and Curze’s war against the Lion, alongside Nostramo, Sevatar, Pharos and The Night Haunter: a late-framed novel looking back on the past.

Begin with Legion: the encounter with the Cabal explains the twins’ choice. Alpharius’s origins and covert interventions in other Legions form the surrounding paths.

Campaign books and lore: Bodt and Tredecimmia. Explore the sources without treating them as the next novel.

Legions, Auxilia, Mechanicum and other armies. Different editions retain their separate identities.