Unnumbered Sons

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Unnumbered Sons
Heraldry is identical to each member's primogenitor Chapter.
Battle Cry Unknown, likely nonexistent
Founding Ultima Crusade
Successors of All First Founding Chapters
Successor Chapters Multiple Ultima Founding Chapters as well as some refounded Chapters (de facto anyway)
Chapter Master n/a, under direct command of Guilliman
Primarch All the Loyalist Primarchs (and maybe the others too although nobody can prove that)
Homeworld Mars (Effectively, No homeworld was ever established)
Strength About 20,000 at the time of the Indomitus Crusade's end, currently disbanded into the Ultima Founding Chapters and into other Chapters in need of reinforcements
Specialty Great coordination and cooperation between astartes with different gene-seed, being a massive pool of reinforcements during the Indomitus Crusade.
Allegiance Imperium
Colours Pale Grey, with heraldry of each member's primogenitor displayed on their pauldrons

The Unnumbered Sons (full name being the Unnumbered Sons of the Primarchs, colloquially known as the Greyshields) are a Chapter of Astartes formed during Ultima Founding, during the Indomitus Crusade. Created by the Lord Commander of the Imperium Roboute Guilliman, this Chapter was comprised of only Primaris Marines, numbering around nine times legion-size. This unnatural size for a chapter is due to the fact that the Unnumbered Sons originally included the entirety of the existent Primarines, made with the geneseed of the nine loyalist primarchs, and made to work as a unit to improve the synergy between different chapters.

Origins of the Unnumbered SonsEdit

After Archmagos Dominus Belisarius Cawl unveiled his 10,000 year project to Guilliman, the Imperium had thousands of these new Primaris Marines ready and available for use. The beginning of the Indomitus Crusade and the Ultima Founding meant that this massive force would have to be used on the battlefield as soon as possible. Thus, the Unnumbered Sons, famous for not wearing any chapter heraldry (having nothing drawn on their pauldrons and nor any colour on their armor, hence the nickname "greyshields"), were forced to push the tides of Chaos back and stop the 13th Black Crusade. During the duration of the conflict, Guilliman used this chapter to draw reinforcements and new chapters, reinforcing under-strength chapters with new blood and establishing entire primarine chapters. This, combined with the losses caused by attrition, meant that the Greyshields' numbers began to shrink fast.

By the time Roboute Guilliman declared the end of the crusade, around 20,000 Greyshields still existed. After the Battle of Raukos was over, Guilliman ordered the disbandment of the Unnumbered Sons, to either add them to already existing chapters who had yet to receive reinforcements or to create more new Astartes Chapters from the final core of veterans; formally rendering them defunct.

Chapters of the Adeptus Astartes
First Founding (M29): Blood Angels - Dark Angels - Imperial Fists - Iron Hands - Raven Guard
Salamanders - Space Wolves - Ultramarines - White Scars
Second Founding (021.M31): Angels of Absolution - Angels Encarmine - Angels Porphyr - Angels of Redemption
Angels Sanguine - Angels of Vengeance - Angels Vermillion - Aurora Chapter - Black Consuls
Black Guard - Black Templars - Blood Drinkers - Brazen Claws - Crimson Fists - Destroyers
Doom Eagles - Eagle Warriors - Excoriators - Fists Exemplar - Flesh Tearers
Genesis Chapter - Inceptors - Iron Snakes - Libators - Lions Sable - Marauders - Mortifactors
Nemesis - Novamarines - Obsidian Glaives - Patriarchs of Ulixis - Praetors of Orpheus
Rampagers - Raptors - Red Talons - Revilers - Silver Eagles - Silver Skulls - Soul Drinkers
Storm Lords - White Consuls - Wolf Brothers
Third to Twelfth Founding
Astral Claws - Angels Revenant - Charnel Guard - Dark Paladins - Executioners
Flesh Eaters - Halo Brethren - Howling Griffons - Iron Knights - Mantis Warriors
Marines Malevolent - Night Swords - Sable Swords (initial)
Scythes of the Emperor - Space Sharks - Sons of Guilliman
Thirteenth Founding (M35): Death Spectres - Exorcists
Fourteenth to Twentieth Founding: Angels of Fire - Avenging Sons - Celebrants
Twenty-First Founding
Black Dragons - Blood Gorgons - Fire Hawks
Flame Falcons - Lamenters - Minotaurs - Sons of Antaeus
Twenty-Second to
Twenty-Sixth Founding (M35-M41):
Angels of Vigilance - Celestial Lions - Dark Hunters - Disciples of Caliban - Emperor's Spears
Fire Angels - Imperial Harbingers - Iron Lords - Knights of the Raven - Marines Errant
Mentors - Fire Claws/Relictors - Star Phantoms - Subjugators
Ultima Founding
Angels of Defiance - Blades of Vengeance - Castellans of the Rift - Fulminators
Knights Cerulean - Knights of the Chalice - Knights of Thunder - Necropolis Hawks
Nemesors - Praetors of Ultramar - Rift Stalkers - Silver Drakes - Silver Templars
Sons of the Phoenix - Storm Reapers - Umbral Knights - Unnumbered Sons
Valiant Blades - Void Tridents - Wolfspear
Unknown Founding: Absolvers - Accipiters - Adulators - Angel Guard - Angels Eradicant - Astral Knights
Blood Ravens - Blood Swords - Brothers Penitent - Crimson Castellans - Crimson Consuls
Crimson Scythes - Dark Hands - Dark Sons - Death Eagles - Fire Lords - Guardians of the Covenant
Graven Spectres - Hammers of Dorn - Harbingers - Hawk Lords - Invaders - Iron Talons
Jade Dragons - Knights of Blood - Knights Unyielding - Marines Exemplar - The Nameless
Night Watch - Rainbow Warriors - Reclaimers - Red Hunters - Red Scorpions - Red Seraphs
Sable Swords (refounded) - Solar Hawks - Sons of Orar - Star Dragons - Stormwatchers
Storm Giants - Storm Wardens - Valedictors - Viper Legion - Vorpal Swords (and the Judged)
Unsanctioned Founding: Consecrators - Sons of Medusa - Steel Confessors
Others: Adeptus Custodes - Astartes Praeses - Deathwatch - Grey Knights