The Siege of Terra may be over, but the wounds left by the Horus Heresy are only beginning to open. Flames of Betrayal is a new English-language paperback omnibus from Black Library that returns readers to the final battles for Terra and the traumatic period immediately following the death of Horus.
Rather than presenting a completely new novel, the release collects two previously published Siege of Terra titles in one paperback: James Swallow’s novella Garro: Knight of Grey and the eight-story anthology Era of Ruin.
That makes Flames of Betrayal an important companion volume for readers who want to see how the Horus Heresy ends for individual soldiers, Space Marines, sorcerers and survivors after the galaxy-changing confrontation between the Emperor and Horus.
Flames of Betrayal release details
| Title | Flames of Betrayal |
|---|---|
| Series | The Horus Heresy: Siege of Terra |
| Publisher | Games Workshop / Black Library |
| Format | English paperback omnibus |
| Release | Late July 2026, depending on region |
| Length | 384 pages |
| ISBN | 978-1-83609-021-2 |
| KR list price | ₩20,000.-, with regional prices varying |
What is included in Flames of Betrayal?
The omnibus is divided into two major parts. The first is a focused Nathaniel Garro story set during the Siege of Terra. The second explores what happens once the battle has ended and the survivors are forced to live with what remains.
Garro: Knight of Grey by James Swallow
Garro: Knight of Grey continues the story of Nathaniel Garro, the loyalist Death Guard captain who escaped the betrayal at Isstvan III and carried news of Horus’s rebellion back to Terra.
During the final battle for the Imperial Palace, Garro is responsible for protecting Euphrati Keeler, the woman regarded as the first saint of the emerging Imperial faith. His mission ultimately places him in the path of Mortarion, the primarch he once followed as the gene-father of the Death Guard.
The resulting confrontation brings Garro’s story back to the betrayal that began in The Flight of the Eisenstein. It is a deeply personal battle between a loyalist son and the corrupted father he rejected.
The Era of Ruin anthology
The second part of the book contains eight short stories set around the conclusion and immediate aftermath of the Siege of Terra. Instead of concentrating only on the Emperor, the primarchs and the largest battles, these stories examine how individuals begin processing the destruction left behind.
The collection moves between Custodians, Space Marines, sorcerers, Imperial Army soldiers and other survivors. Victory has technically been achieved, but the Imperium emerging from the Heresy is wounded, traumatised and very different from the civilisation envisioned during the Great Crusade.
Complete story list
- Garro: Knight of Grey — James Swallow
- Angels of Another Age — John French
- Fulgurite — Nick Kyme
- Fragments (All We Have Left) — Dan Abnett
- Ex Libris — John French
- System Purge — Gav Thorpe
- After the Dawn, the Darkness — Guy Haley
- Homebound — Chris Wraight
- The Carrion Lord of the Imperium — Aaron Dembski-Bowden
Which characters appear?
Nathaniel Garro is the central character of the opening novella, but the anthology section expands the scope considerably.
In John French’s Ex Libris, Ahzek Ahriman attempts to gather knowledge about the Warp before the strange conditions created by the Siege disappear. The story provides another step in Ahriman’s journey from a warrior of the Thousand Sons into one of the setting’s most dangerous and obsessive sorcerers.
Chris Wraight’s Homebound follows Ilya Ravallion after the devastation suffered by the White Scars. She must decide whether she still belongs beside the Legion or whether she should finally leave the war behind and search for peace.
Other stories focus on less celebrated figures, including ordinary soldiers and servants of the Imperium attempting to understand what survival means after Terra has been transformed into a battlefield.
Where does Flames of Betrayal fit in the Siege of Terra?
Some retailer listings place Flames of Betrayal alongside the numbered Siege of Terra novels, occasionally describing it as the ninth book in the series. Games Workshop, however, describes the release as an omnibus.
It is therefore best understood as a companion and epilogue collection rather than another main Siege novel. Garro: Knight of Grey takes place during the final battle, while the stories from Era of Ruin look toward the broken Imperium that follows.
Together, the stories help bridge the gap between the conclusion of the Horus Heresy and the darker future of the Imperium. Horus has been defeated, but many of the institutions, beliefs and obsessions that will define Warhammer 40,000 are now beginning to take shape.
Is this a new Horus Heresy book?
The paperback itself is a new English release, but the material inside has previously been available separately.
This distinction is important for collectors. Anyone who already owns both Garro: Knight of Grey and Era of Ruin will already have the stories collected here. The main attraction for those readers will be having everything together in a matching paperback format.
For readers who missed either release, however, Flames of Betrayal provides a convenient and comparatively affordable way to obtain the complete Garro novella and all eight aftermath stories in one volume.
Who should read Flames of Betrayal?
This release will be most rewarding for readers who have already reached the later stages of the Horus Heresy or completed the main Siege of Terra novels. Many of its emotional moments depend on understanding the characters, sacrifices and betrayals that led to the fall of Horus.
Nathaniel Garro fans will find the conclusion of a storyline that began near the start of the Heresy series. Readers interested in the White Scars, Thousand Sons, Custodians and the early Imperial faith will also find several important character moments.
It is not the ideal starting point for someone completely new to the Horus Heresy. A new reader would understand the general conflict, but much of the impact would be lost without knowing what happened at Isstvan, why Garro rejected Mortarion and how Terra reached its ruined state.
Is Flames of Betrayal worth buying?
For paperback collectors and readers who do not already own the two included books, this is a strong release. It offers one substantial novella and eight short stories from some of Black Library’s best-known Horus Heresy authors.
The collection also offers something the largest Siege novels could not always provide: time to examine the personal consequences of the war. The Emperor may have survived and Horus may be dead, but victory has not restored what was lost.
Flames of Betrayal is ultimately a book about survivors standing among the ruins of a dream. It closes the story of Nathaniel Garro while showing the first painful steps toward the Imperium of Warhammer 40,000.
The Siege of Terra has ended, but for the Imperium and those who fought for it, the real age of ruin is only beginning.
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