The Horus Heresy (Forge World Series) - Core Books: The core campaign books of the Horus Heresy Series, known informally among fans as the "Black Books," are black in colour and leather-bound with embossed metal corners and are lavishly printed in full colour. These books detail the background of the Horus Heresy and the Great Crusade, the various armies and factions involved and the battles in which they fought. These books also include the Battles in the Age of Darkness expansion rules, army lists, unit profiles, full campaign systems, missions and more.1. The Horus Heresy: Book One - BetrayalThe Horus Heresy: Book One - Betrayal is the first book in the Horus Heresy series by Forge World. Betrayal spans events from the end of the Great Crusade to the beginning of the Horus Heresy, mainly the Istvaan III Atrocity. The book contains rules and special characters for the pre-Heresy Sons of Horus, World Eaters, Emperor's Children, and Death Guard Legions as well as a Space Marine Crusade Legion army list. Betrayal is part of a trilogy that spans the events that make up the beginning of the Horus Heresy, including the Istvaan III Atrocity, the Drop Site Massacre of Istvaan V, the Battle of Phall, and the Battle of Paramar.2. The Horus Heresy: Book Two - MassacreThe Horus Heresy: Book Two - Massacre is the second book in the Horus Heresy series by Forge World. Massacre is the first book that involves the Drop Site Massacre of Istvaan V. The book contains rules and special characters for the pre-Heresy Iron Hands, Salamanders, Night Lords, and Word Bearers Legions as well as a Space Marine Crusade Legion army list. Massacre is part of a trilogy that spans the events that make up the beginning of the Horus Heresy, including the Istvaan III Atrocity, the Drop Site Massacre of Istvaan V, the Battle of Phall, and the War for Paramar.3. The Horus Heresy: Book Three - Extermination 	 	<a href="https://static.wikia.nocookie.net/warhammer40k/images/e/e6/HorusHeresyExtermination.png/revision/latest?cb=20140709075941" class="image"><img alt="HorusHeresyExtermination" src="https://static.wikia.nocookie.net/warhammer40k/images/e/e6/HorusHeresyExtermination.png/revision/latest/scale-to-width-down/120?cb=20140709075941" decoding="async" loading="lazy" width="120" height="164" class="thumbimage" data-image-name="HorusHeresyExtermination.png" data-image-key="HorusHeresyExtermination.png" data-relevant="1" data-src="https://static.wikia.nocookie.net/warhammer40k/images/e/e6/HorusHeresyExtermination.png/revision/latest/scale-to-width-down/120?cb=20140709075941" /></a>The Horus Heresy: Book Three - Extermination is the third book in the Horus Heresy series by Forge World. Extermination is the second and final book that involves the Drop Site Massacre of Istvaan V. The book contains rules and special characters for the pre-Heresy Iron Warriors, Raven Guard, Alpha Legion, and Imperial Fists Legions as well as a Space Marine Crusade Legion army list. Extermination is part of a trilogy that spans the events that make up the beginning of the Horus Heresy, including the Istvaan III Atrocity, the Drop Site Massacre of Istvaan V, the Battle of Phall, and the War for Paramar.4. The Horus Heresy: Book Four - Conquest 	 	<a href="https://static.wikia.nocookie.net/warhammer40k/images/9/9a/Horus_Herersy_Conquest_Cover.png/revision/latest?cb=20141111065110" class="image"><img alt="Horus Herersy Conquest Cover" src="https://static.wikia.nocookie.net/warhammer40k/images/9/9a/Horus_Herersy_Conquest_Cover.png/revision/latest/scale-to-width-down/120?cb=20141111065110" decoding="async" loading="lazy" width="120" height="163" class="thumbimage" data-image-name="Horus Herersy Conquest Cover.png" data-image-key="Horus_Herersy_Conquest_Cover.png" data-relevant="1" data-src="https://static.wikia.nocookie.net/warhammer40k/images/9/9a/Horus_Herersy_Conquest_Cover.png/revision/latest/scale-to-width-down/120?cb=20141111065110" /></a>The Horus Heresy: Book Four - Conquest is the fourth book in the Horus Heresy series by Forge World. Containing no new Space Marine Legions or Primarchs, Conquest instead features updated army lists for the Mechanicum, Dark Mechanicum, and the Space Marine Legions including the ability to field a Shattered Legions army and additional new Legion units and vehicles. The book does, however, contain two new Horus Heresy era army lists, the Solar Auxilia of the Imperial Army, and the Knight Houses of the Questoris Familia. The book details Horus' war on the Northern Imperium, including the following battles and campaigns: Battles of the Cyclops Cluster, The Siege of Mezoa, Conquest of Manachea, and the Defence of Agathon.5. The Horus Heresy: Book Five - Tempest 	 	<a href="https://static.wikia.nocookie.net/warhammer40k/images/a/ac/HorusHeresyVTempest.png/revision/latest?cb=20160201182048" class="image"><img alt="HorusHeresyVTempest" src="https://static.wikia.nocookie.net/warhammer40k/images/a/ac/HorusHeresyVTempest.png/revision/latest/scale-to-width-down/120?cb=20160201182048" decoding="async" loading="lazy" width="120" height="164" class="thumbimage" data-image-name="HorusHeresyVTempest.png" data-image-key="HorusHeresyVTempest.png" data-relevant="1" data-src="https://static.wikia.nocookie.net/warhammer40k/images/a/ac/HorusHeresyVTempest.png/revision/latest/scale-to-width-down/120?cb=20160201182048" /></a>The Horus Heresy: Book Five - Tempest is the fifth book in the Horus Heresy series by Forge World. Tempest covers the Battle of Calth between the Word Bearers and the Ultramarines Legions. The book is to be part of a duology, with book 5 covering the Battle of Calth, and a later book covering the Shadow Crusade, the Battle of Armatura, and the Underworld War. This book will feature one new Legion in the Ultramarines, new units for the Word Bearers, new units for the Imperial Army (Warp Cultists and Imperial Militia), Mechanicum and Dark Mechanicum units, and new Space Marine Legion units and vehicles.6. The Horus Heresy: Book 6 - Retribution  	 	<a href="https://static.wikia.nocookie.net/warhammer40k/images/d/d7/HorusHeresyRetributionCover.png/revision/latest?cb=20170203180055" class="image"><img alt="HorusHeresyRetributionCover" src="https://static.wikia.nocookie.net/warhammer40k/images/d/d7/HorusHeresyRetributionCover.png/revision/latest/scale-to-width-down/120?cb=20170203180055" decoding="async" loading="lazy" width="120" height="164" class="thumbimage" data-image-name="HorusHeresyRetributionCover.png" data-image-key="HorusHeresyRetributionCover.png" data-relevant="1" data-src="https://static.wikia.nocookie.net/warhammer40k/images/d/d7/HorusHeresyRetributionCover.png/revision/latest/scale-to-width-down/120?cb=20170203180055" /></a>The Horus Heresy: Book Six - Retribution is the sixth book in the Horus Heresy Series by Forge World. This book takes place during the Shadow Wars of the Age of Darkness and follow the exploits of the Shattered Legions and the Knights-Errant during their campaign of vengeance against the Traitor Legions. The forces of the Blackshield Factions, the Forge World of Xana, the Knight Houses of Malinax, and the Warmaster's Traitor Legions will also be included. The Legion traits for the Dark Angels, Blood Angels, and the White Scars Legions, along with new rules, units, and characters for the already released Legions and Factions are also included. The Primarchs, Characters, and special units for unreleased Legions will be released in later volumes.7. The Horus Heresy: Book 7 - Inferno 	 	<a href="https://static.wikia.nocookie.net/warhammer40k/images/c/ce/HorusHeresyBook7InfernoCoverSideways.jpg/revision/latest?cb=20170124134137" class="image"><img alt="HorusHeresyBook7InfernoCoverSideways" src="https://static.wikia.nocookie.net/warhammer40k/images/c/ce/HorusHeresyBook7InfernoCoverSideways.jpg/revision/latest/scale-to-width-down/120?cb=20170124134137" decoding="async" loading="lazy" width="120" height="197" class="thumbimage" data-image-name="HorusHeresyBook7InfernoCoverSideways.jpg" data-image-key="HorusHeresyBook7InfernoCoverSideways.jpg" data-relevant="1" data-src="https://static.wikia.nocookie.net/warhammer40k/images/c/ce/HorusHeresyBook7InfernoCoverSideways.jpg/revision/latest/scale-to-width-down/120?cb=20170124134137" /></a>The Horus Heresy: Book Seven - Inferno is the seventh book in the Horus Heresy Series by Forge World. The book covers the Fall of Prospero and features the Thousand Sons and Space Wolves Legions along with the Prospero Spireguard, the Arkhadine Mechanicum, the Legio Titanicus. Inferno also covers the Talons of the Emperor, two completely new Horus Heresy era factions: the Legio Custodes and the Sisters of Silence.  Before the release of Inferno Games Workshop proper released a new Horus Heresy era set called Burning of Prospero, this set helps with the abundance of new units needing released all at once, with new Thousand Sons, Space Wolves, Sisters of Silence, and Legio Custodes units.8. The Horus Heresy: Book 8 - MalevolenceThe Horus Heresy: Book Eight - Malevolence is the eighth book in The Horus Heresy series by Forge World. This book covers the Blood Angels and White Scars Legions. Malevolence explores the rest of the Blood Angels' battle on Signus Prime against hordes of Chaos Daemons and the White Scars' Chondax Campaign. Malevolence includes additional information and rules for the Alpha Legion and additional rules for Chaos Daemons.9. The Horus Heresy: Book 9 - CrusadeThe Horus Heresy: Book Nine - Crusade is an upcoming book in the Horus Heresy series by Forge World. This book will cover the Dark Angels Legion. Crusade will explore the Dark Angels' Thramas Crusade against the Night Lords Traitor Legion. Crusade will include additional information and rules for the Night Lords Legion. The release date is unknown at this time, but it is most likely sometime in 2020.