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Lost Chapter

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Lost Chapters are Space Marine Chapters that have been destroyed. Some were annihilated in one sudden strike, while others were slowly diminished through attrition, being unable for whatever reason to recruit new marines fast enough to replace combat losses. Information about such chapters is often lost during the millennia and all-too scarce.

They should not to be confused with Renegade Chapters or Chaos Space Marine forces, who have been declared Excommunicate Traitoris by the Inquisition and/or the High Lords of Terra. These forces technically still exist but have gone rogue, breaking their vows of loyalty towards the Imperium. Some of them simply fell to Chaos, others are idealistic rebels who rejected the all-too oppressive Imperial authority for some reason.

List

Name Origin Founding Notes Sources
Angels Excelsis Blood Angels Destroyed during the Devastation of Baal The Devastation of Baal (Novel), Chapter 24
Angels Glorious Blood Angels Destroyed during the Devastation of Baal The Devastation of Baal (Novel), Chapter 24
Angels of Retribution Destroyed in an ambush on Alantor X. The Officio Assassinorum are believed to have been involved in their destruction. Dataslate: Officio Assassinorum, pg. 9
Astral Drakes Destroyed by the Orks of Ghazghkull Mag Uruk Thraka. Codex: Orks (8th Edition), pg. 69 — Ghazghkull Thraka
Astral Knights Imperial Fists Sacrificed their chapter to destroy the Necron World Engine. Codex: Space Marines (5th Edition), pg. 49
Blades Eternal Lost in the Abyssal Crusade Codex: Chaos Space Marines (6th Edition), pgs. 17–19
Blood Eagles Blood Angels Fell into a civil war which resulted in the survivors splitting into two Chapters, the Angels Numinous and Red Seraphs. White Dwarf 454, pgs. 42-43 - Tradition's End (Short Story)
Blood Wings Blood Angels Destroyed during the Devastation of Baal The Devastation of Baal (Novel), Chapter 24
Brazen Skulls Extinct by 773.M41. Refounded in Ultima Founding Sabbat Martyr (Novel), Chapter 2, pg. 46
Brothers of Jarad Blood Angels Destroyed during the Devastation of Baal. The Devastation of Baal (Novel), Chapter 24
Burning Blood Blood Angels Lost during the Devastation of Baal. The Devastation of Baal (Novel), Chapter 24
Celestial Swords One of two Chapters Founded at the same time and were mistakenly given the same name and heraldries by the Administratum. Destroyed by Abaddon's forces during the Ninth Black Crusade. Codex: Space Marines (8th Edition), pg. 59 — Unknown Foundings: A Legacy Reforged
Celestial Swords The other one of two Chapters Founded at the same time and were mistakenly given the same name and heraldries by the Administratum. Destroyed by Abaddon's forces during the Ninth Black Crusade. Codex: Space Marines (8th Edition), pg. 59 — Unknown Foundings: A Legacy Reforged
Chorus of Eltain Lost in the Abyssal Crusade. Codex: Chaos Space Marines (6th Edition), pgs. 17–19
Crimson Axes Imperial Fists Lost by 092.M39. Imperial Armour Volume Ten - The Badab War - Part Two, pg. 84
Crimson Consuls Ultramarines Annihilated by the Alpha Legion. The Long Games at Carcharias (Short Story)
Crimson Legion Blood Angels Index Astartes: Death Company, pg. 7
Dark Paladins Third Founding Fell in battle against mechanical Xenos, believed to be the Necrons. Tau & Necron Collectors' Guide, pg. 45
Emperor's Swords (Ghorstangrad) Annihilated by the Alpha Legion. Codex: Space Marines (5th Edition), pg. 49
Fire Hawks Ultramarines 21st Founding Lost in the Warp, survivors believed to be the Legion of the Damned. Imperial Armour Volume Nine - The Badab War - Part One, pg. 66
Codex: Ultramarines (2nd Edition) pg. 63
White Dwarf 99 (UK) - Index Astartes: Legion of the Damned
Fists Exemplar Imperial Fists Second Founding Depleted during the War of the Beast and later disbanded by its former Chapter Master Maximus Thane. The Beheading (Novel), Chapter 14
Fists of Olchis Lost in the Abyssal Crusade Codex: Chaos Space Marines (6th Edition), pgs. 17–19
Knights of Blood Blood Angels Sacrificed themselves during the Devastation of Baal. Codex: Blood Angels (5th Edition), pg. 54
The Devastation of Baal (Novel), Chapter 14, 26, 30
Knights of Eternity Recorded as annihilated during M41 by Hive Fleet Kraken. Codex: Tyranids (5th Edition), pg. 23
Knights Sanguine Blood Angels Consumed by war Codex Supplement: Blood Angels (9th Edition), pg. 30 - Successor Chapters
Lions Sable Dark Angels Second Founding Fate tied to the Forgotten Wars, truth hidden by the Inner Circle. Dataslate: Cypher - Lord of the Fallen pg. 19
Marines Vigilant Destroyed by the Crimson Fists after their minds were shattered by an encounter with xenos. Deathwatch: Honour the Chapter, pg. 58
Nova Legion Ultramarines Destroyed by the Alpha Legion. Sons of the Hydra (Novel), Part I, Chapter γ: Turning Tail
Part I, Chapter δ: The Viper's Nest
Obsidian Glaives Ultramarines Annihilated by the Red Waaagh!. Warhammer 40,000 7th Edition Rulebook (E-Book) - Waaagh! Grukk
Prophets of Mercury Lost in the Abyssal Crusade. Codex: Chaos Space Marines (6th Edition), pgs. 17–19
Scar Lords Second Founding Destroyed during the Battle of Vior'los. Farsight: Crisis of Faith (Novel), Chapters 18-19
Redemption on Dal'yth (Short Story)
Shadow Wolves Destroyed in battle when Tyranids invaded their chapter homeworld. Helsreach Chapter Five
Silver Stars Hinted that the cause was a failure to collect sufficient gene-seed. Conquest of Armageddon (Novel), Chapter Two
Sky Sentinels Destroyed while defending their Homeworld, from a Chaos invasion led by the Daemon Primarch Magnus. Warhammer 40,000 8th Edition Rulebook, pg. 151 — Dark Imperium
Sons of Gideon Destroyed by the Crimson Fists after falling to heresy. Deathwatch: Honour the Chapter, pg. 58
Sons of Gorgax Hinted that the cause was a failure to collect sufficient gene-seed. Conquest of Armageddon (Novel), Chapter Two
Sons of the Raven Destroyed by the forces of Chaos in the Sarum Ambush. Imperial Armour Volume Thirteen - War Machines of the Lost and the Damned, pg. 22 — The Martyred Sons
Star Scorpions 25th Founding A mixture of redundant gene-seed and becoming lost in the warp. Survivors become the The Pure White Dwarf 98 (UK), pg. 39
Spear of the Emperor (Novel), Chapter XVII
Tiger Claws Astral Claws Lost in the warp. Survivors joined the Astral Claws. Codex: Ultramarines (2nd Edition) pg. 63
Venerators Destroyed during the 5th Black Crusade. Codex: Chaos Space Marines (8th Edition), pg. 23
Vindicators Ultramarines Destroyed by the Alpha Legion Sons of the Hydra (Novel), Part I, Chapter δ: The Viper's Nest
Warhawks Destroyed during the 5th Black Crusade. Codex: Chaos Space Marines (8th Edition), pg. 23
Wolf Brothers Space Wolves Second Founding Disbanded due to degenerative mutation Codex: Space Wolves (2nd Edition), pg. 9

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