Extinct chapters

This page is dedicated in remembrance of all those Space Marine Chapters that are entirely and definitely very dead. This does not include chapters that fell to Chaos, so all those lost (wiped out, turned heretic, barely survived or still missing) during the Abyssal Crusade aren't listed here, for that see Judged. Special mentions to the 2 lost legions.

Angels of Retribution

One of those Chapters made to fill in a spot, they were destroyed entirely in an ambush on the planet Alantor X. Allegedly, the Officio Assassinorum was involved.

Astral Knights

Sacrificed their chapter to destroy the Necrons' World Engine in 926.M41. Last few survivors, consisting of 30 Marines and Dreadnought Thade (who was effectively Chapter Master), either attacked their replacement Chapter (the Sable Swords, which were refounded themselves to replace the Astral Knights) and wiped out or convinced by the Sable Swords to partake in a Crusade until their deaths in battle. It is believed that the survivors departed on the crusade, but their fates are unknown.

Celestial Swords... and Celestial Swords

In an epic failure of Imperial bureaucracy, these two chapters were founded with identical heraldry and names in the 38th Millenium in an unknown founding and from an unknown lineage at the same time. The mistake wasn't discovered until both Chapters went to the same engagement against the 9th Black Crusade (537.M38) and were both wiped to a man and the bodies of nearly two thousand Battle Brothers were found in the Cicerine System. In a small stroke of mercy, both Chapters were wiped out within the same millenium they were founded in and in the same engagement, preventing further confusion.

Crimson Castellans

This chapter was fighting against renegades from their own chapter when a Tyranid Hive Fleet came by and ate them both, a handful of loyalists who were away from the civil war on other deployments when the fighting broke out were absorbed into other Chapters.

Crimson Consuls

Seriously, don't put crimson in the chapter's title if you want it to live. This chapter was taken out piece by piece in a series of freak accidents which were only discovered to have been arranged by the Alpha Legion when their battle-brothers' subliminal programming was activated to wipe out the Chapter leadership.

Dark Paladins

Annihilated by Necrons while investigating Jarrman Prime.

Emperor's Swords

Destroyed by the Alpha Legion who contaminated their recruiting pool and implanted subconscious triggers in their recruits. You'd think that after what happened to the Crimson Consuls, chapters would take measures against this specific brand of Alpha Legion fuckery, but it seems that some fools are destined fall for the same trick twice.

Emperor's Swords again

Based on Bellicas, which turned out to be a tomb world. And yes, just like the Celestial Swords they shared a name with a different Chapter which was also wiped out. Begin face-palming.

Fire Hawks

Lost in the warp. Surviving members may or may not make up the Legion of the Damned.

Fists Exemplar

Discreetly replaced the completely depleted Imperial Fists along with a handful of other volunteers from the Imperial Fists' other successors after The War of The Beast, with their records purged on orders of their last Chapter Master Maximus Thane (he became the rebuilt Imperial Fists Chapter Master) after it was discovered that the remaining members of the chapter had defected to the Iron Warriors (specifically, a unit under the last First Captain, Zerbyrn, was forced to ally with them during WAAAGH! The Beast as they lost contact with the Imperium and killed Imperial troops in their defense, but one company of loyalists managed to return and also joined the rebuilt Imperial Fists).

Flame Falcons

A chapter from the Cursed Founding. Declared excommunicate traitoris by the Inquisition and officially extinguished by Grey Knights. Few survived.

Imperial Fists

I know what you're thinking: the Imperial Fists? Sons of Rogal Dorn and descendants of the VIIth Legiones Astartes, wiped out to a man? Well, it's more likely than you'd think. So much so that their Primarch specifically put in place a plan called the "Last Wall protocol" in case this exact scenario ever were to happen: it basically consists of rebuilding the Imperial Fists from their successors, since they have the same geneseed. That's it. You can tell Dorn made it by how straightforward it is. When the chapter was destroyed durng the War of The Beast, it was secretly replenished with Fists Exemplar and other successors thanks to the Last Wall protocol.

Knights of Blood

Sacrificed to a man in a desperate effort to protect Baal from the Tyranid and Khorne-Daemon smackdown. Due to their reputation as borderline-heretics, it wasn't rebuilt in the Ultima Founding.

Knights of Eternity

Another chapter presumed to have been eaten by the Kraken.

Obsidian Glaives

Chapter destroyed by the Red Waagh. Detailed in Sanctus Reach campaign.

Sable Swords

Extinct by M41. Refounded to replace Astral Knights.

Soul Drinkers

Declared extinct. After becoming disillusioned with the Imperium and turning renegade, they were finally brought to trial and ended up sacrificing themselves to fend off a daemon army, the three loyalist survivors exiled themselves to the warp along with their Chaos turned brother. Have apparently been recreated with Primaris Marines as part of the Ultima Founding.

Tiger Claws

Lost in the warp, surviving members absorbed by their founders, the Astral Claws, who later caused the Badab War and turned traitor as the Red Corsairs after escaping following the defeat.

Unnumbered Sons

The initial reserve of Primaris Marines who weren't part of the first wave of the Ultima Founding that Guilliman took with him on the Indomitus Crusade and used to reinforce existing Chapters, refound Chapters or found new Chapters in the intermittent portion of the Ultima Founding along the way, before they were entirely reorganized into existing chapters or formed new or legacy chapters. Not technically extinct, but no longer exists as a functioning unit and was officially disbanded when their final core of veterans after the Battle of Raukos (which ended the first phase of the Indomitus Crusade) were used for the last wave of the Ultima Founding and to reinforce the few Chapters that hadn't yet received reinforcements.

Wolf Brothers

Succumbed to the instabilities of their gene-seeds. Any survivors are now feral wulfen or renegades fighting among the Red Corsairs and possibly Skyrar's Dark Wolves.