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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 Unknown Destroyed during the Devastation of Baal
Angels Glorious Blood Angels Unknown Destroyed during the Devastation of Baal
Angels of Retribution Unknown Unknown 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 Unknown Unknown Destroyed by the Orks of Ghazghkull Mag Uruk Thraka. Codex: Orks (8th Edition), pg. 69 — Ghazghkull Thraka
Astral Knights Imperial Fists Unknown Sacrificed their chapter to destroy the Necron World Engine. Codex: Space Marines (5th Edition), [Needs Citation]
Blades Eternal Unknown Unknown Lost in the Abyssal Crusade Codex: Chaos Space Marines (6th Edition), pgs. 17–19
Blood Wings Blood Angels Unknown Destroyed during the Devastation of Baal
Brazen Skulls Unknown Unknown Circumstances unknown. Sabbat Martyr (Novel), [Needs Citation], pg. 46
Brothers of Jarad Blood Angels Unknown Destroyed during the Devastation of Baal.
Brothers of the Red Blood Angels Unknown Fatally undone by the Black Rage. Death of Integrity (Novel), Chapter 11, pg. 109
Burning Blood Blood Angels Unknown Lost during the Devastation of Baal.
Celestial Swords Unknown Unknown Lost in the 9th Black Crusade.
Chorus of Eltain Unknown Unknown Lost in the Abyssal Crusade. Codex: Chaos Space Marines (6th Edition), pgs. 17–19
Crimson Axes Imperial Fists Unknown Lost by 092.M39. [Needs Citation]
Crimson Consuls Ultramarines Unknown Annihilated by the Alpha Legion. The Long Games at Carcharias (Short Story);
Atlas Infernal (Novel), [Needs Citation], pgs. 21–40
Crimson Legion Blood Angels Unknown Circumstances unknown. Index Astartes: Death Company, pg. 7
Dark Paladins Unknown Third Founding Fell in battle against mechanical Xenos, believed to be the Necrons. Tau & Necron Collectors' Guide, pg. 45
Emperor's Swords (Bellicas) Unknown Unknown Annihilated by Necrons. Codex: Space Marines (5th Edition), pg. 49

Codex: Necrons (5th Edition), pg. 27

Emperor's Swords (Ghorstangrad) Unknown Unknown Annihilated by the Alpha Legion. Codex: Space Marines (5th Edition), pg. 49
Exsanguinators Blood Angels Unknown Fatally undone by the Black Rage. Death of Integrity (Novel), Chapter 11, pg. 109
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 Unknown Unknown Lost in the Abyssal Crusade Codex: Chaos Space Marines (6th Edition), pgs. 17–19
Golden Sons Blood Angels Unknown Devastation of Baal Index Astartes: Death Company, pg. 7
Knights of Blood Blood Angels Unknown Sacrificed themselves during the Devastation of Baal.
Knights of Eternity Unknown Unknown Recorded as annihilated during M41 by Hive Fleet Kraken. Codex: Tyranids (5th Edition), pg. 23
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 Unknown Unknown Destroyed by the Crimson Fists after their minds were shattered by an encounter with xenos. Deathwatch: Honour the Chapter, pg. 58
Nova Legion Ultramarines Unknown Destroyed by the Alpha Legion.
Obsidian Glaives Ultramarines Unknown Annihilated by the Red Waaagh!. [Needs Citation]
Prophets of Mercury Unknown Unknown Lost in the Abyssal Crusade. Codex: Chaos Space Marines (6th Edition), pgs. 17–19
Shadow Wolves Unknown Unknown Destroyed in battle when Tyranids invaded their chapter homeworld. Helsreach Chapter Five
Silver Stars Unknown Unknown Hinted that the cause was a failure to collect sufficient gene-seed. Conquest of Armageddon (Novel), Chapter Two
Sky Sentinels Unknown Unknown 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 Unknown Unknown Destroyed by the Crimson Fists after falling to heresy. Deathwatch: Honour the Chapter, pg. 58
Sons of Gorgax Unknown Unknown Hinted that the cause was a failure to collect sufficient gene-seed. Conquest of Armageddon (Novel), Chapter Two
Sons of the Raven Unknown Unknown 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 Unknown 25th Founding A mixture of redundant gene-seed and becoming lost in the warp. White Dwarf 98 (UK), [Needs Citation]
Tiger Claws Astral Claws Unknown Lost in the warp. Survivors joined the Astral Claws. Codex: Ultramarines (2nd Edition) pg. 63
Venerators Unknown Unknown Destroyed during the 5th Black Crusade. Chapter Approved 2001[Needs Citation]

Liber Chaotica: Khorne[Needs Citation]

Vindicators Ultramarines Unknown Destroyed by the Alpha Legion Sons of the Hydra (Novel), Part I — The Viper's Nest
Warhawks Unknown Unknown Destroyed during the 5th Black Crusade. Liber Chaotica: Khorne, [Needs Citation]
Wolf Brothers Space Wolves Second Founding Disbanded due to degenerative mutation Codex: Space Wolves (2nd Edition), pg. 9

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