The Horus Heresy series did something unprecedented in licensed fiction. It took an outcome everyone knew (Horus loses, the Emperor is enthroned, the Imperium decays) and made it gut-wrenching.
Basically, read these first: * Horus Rising. * False Gods. * Galaxy in Flames. * Flight of the Eisenstein. Horus Heresy Reading Order : r/40kLore - Reddit 21 Sept 2025 — Warhammer 40k - Horus Heresy - Books 1-54 -comp...
Now, pick up Horus Rising . Turn to page one. And remember: you were there, the day Horus slew the Emperor. The Horus Heresy series did something unprecedented in