How is a new space marine chapter created?

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**Somedude593**

I know they do give some instances such as the creation of the Sable swords from the remnants of the Astral Knights but how exactly do they set it up initially? Do they just get a company of space marines from another chapter and say here's some geneseed, a fort and let them go on with their business? How do they pick who forms the new chapter? would they ask for volunteers among the squads of a chapter or just send one of the Battle companies and maybe a squad or two of vets from first company?

**Zweischneid**

"Such is the woe cast upon the Domains of the God-Emperor of Mankind in these times that in their wisdom and beneficience, the High Lords of Terra have this day issued this decree: Let there be a Founding of the Adeptus Astartes, and let the foes of the Emperor know that this galaxy belongs to Him, now and forever."
— High Lord Tagus, Convenor of the 349th Congress of the Imperium

New Space Marine Chapters are not created piecemeal as required by the Imperium's strategic needs, but rather in deliberate groupings called "Foundings." The process by which a new Founding's creation is approved by the Imperial government is mysterious and arcane, subject to decades or even centuries of planning before it is announced. It is only by an edict of the High Lords of Terra that such an undertaking as the creation of new Chapters can be instigated, for it requires the cooperation and mobilisation of countless divisions within the Imperium's monolithic and vast governmental organisations. Establishing new Astartes Chapters on an individual basis is nigh impossible--the mobilisation of such vast resources is beyond the ability of any single segment of the Imperium.

The Adeptus Mechanicus plays an essential role in the process of a Founding, for its highest echelons are tasked with creating, testing and developing the gene-seed samples that will provide the genetic foundation of the new Chapters. Entire Forge Worlds may be turned over to the manufacture of the mighty arsenal of weaponry, ammunition, Power Armour, vehicles and starships that any such force will require. There are a myriad of other concerns as well. A suitable homeworld inhabited by humans must be identified for the new Chapter, which will likely provide not only a secure and defensible base of operations, but also a source of new recruits as well. Such worlds might have been reported by itinerant Rogue Traders and earmarked centuries before by Adeptus Mechanicus Explorators as potential Astartes homeworlds. A degree of environmental terraforming might be required and the natives of the world (if they are to become the source of the new Chapter's Aspirants) must be studied and tested by the Mechanicus' Magos Biologis and Genetors for many generations to ensure they are genetically pure and free of any strain of mutation that might later affect the Chapter itself. The construction of a Chapter's fortress-monastery may be one of the greatest undertakings of all, drawing on the genius of the Imperium's most accomplished military architects and engineers. If the Chapter is to be fleet-based, then even more work must be put into the construction of a massive Chapter Barque or an unusually large Battle Barge to serve as the Chapter's mobile fortress-monastery and all of the related capital warships and Escorts such a highly-mobile Chapter will require.

The already extant Space Marine Chapters may also have a role in this process, though to what degree can vary greatly from Founding to Founding. Many of the First Founding Chapters maintain close links with Chapters created using their own gene-seed stocks, and the Chapter Masters might have a hand in planning future Foundings using that genetic material. It is said that the Disciples of Caliban, a Dark Angels Successor Chapter, was created following the direct appeal of the Supreme Grand Master of the Dark Angels, an extremely rare request.

In the more than 10,000 standard years that have passed since the First Founding of the 20 original Space Marine Legions by the Emperor, there have been 25 subsequent Foundings of new Chapters of the Adeptus Astartes; with the most recent, the 26th Founding, occurring in the year 738.M41, approximately 250 standard years ago. Even before a new Founding is announced, entire generations of Imperial servants may have toiled in preparation. Even once the process has been declared and is underway, it is likely to be at least a standard century before the new Chapters are ready to begin combat operations. In times of dire need for the Imperium, faster development has been attempted, but this has often resulted in disaster. Gene-seed cultured in haste is likely to degrade or to mutate, and a great many other factors can lead the entire process astray. And there is no foe more dangerous to the Imperium of Man that a Space Marine who has been corrupted by Chaos or gone Renegade for another reason.

[edit]

In short, as with anything related to the IoM; try to think of the most cumbersome, inefficient, bureaucratic and most needlessly convoluted and laborious way to go about it. Make that even more arbitrarily long-winded and arcane by whatever administrative snags you could think of. Always add at least one century of stuff getting lost in Imperial proceedings and intrique. Than you're starting to get there.