Any collection worth its salt includes the final act:
The Horus Heresy is a civil war within the Imperium of Man, where the Warmaster Horus, once the most trusted of the Emperor's generals, turns against his master. This conflict shakes the foundations of the Imperium and leads to a galaxy-wide civil war. The Horus Heresy eBook Collection 109 brings together a curated selection of novels, novellas, and short stories that expand on this critical period in Warhammer 40,000 lore.
While the main story is told through 54 novels (from Horus Rising by Dan Abnett to The End and the Death Vol 3 by Graham McNeill), a collection numbering over 100 items indicates the inclusion of the "hidden" lore. A complete collection usually includes: horus heresy ebook collection 109
A collection of 109 would not be complete without Tales of Heresy, Age of Darkness, and The Primarchs. These books explain what minor characters were doing during the major battles.
For the obsessed lore master: Yes. The complete 109-ebook collection provides context you cannot get elsewhere. For example, The Crimson King (novella) explains why Magnus refuses to help Horus at a critical moment—a detail only hinted at in the main novels. Any collection worth its salt includes the final
For the casual reader: No. You will burn out. The Horus Heresy has pacing issues (Books 8-11 are notoriously slow). Start with a starter collection (Books 1-4) and build up.
For the digital collector: The 109 collection is the Holy Grail. It represents a complete narrative of the Imperium’s founding trauma. Having all 109 ebooks on a single e-reader, indexed by timeline, is the ultimate Warhammer 40k reading experience. While the main story is told through 54
The final 31 ebooks in a full 109 collection are the anthologies and novellas that cannot be skipped:
This middle block contains fan favorites like Know No Fear (Word Bearers vs. Ultramarines), Betrayer (Angron’s apotheosis), and Scars (the White Scars’ internal war).
As of 2025, the Horus Heresy is "complete," but Black Library continues to release Horus Heresy: Character Series and Horus Heresy: Exemplary Battles ebooks. By the end of 2026, the "complete" collection may be 115 or 120 books.
So, if you find a Horus Heresy ebook collection 109, know that it is a snapshot in time. It represents the Golden Age of the series—the period before the final End and the Death volumes were broken into three parts.