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The '''Thirteenth Founding''' or '''Dark Founding''' was one of the instances where new [[Space Marine]] [[Chapter]]s were created. The details of the Thirteenth Founding are almost completely unknown; it is unknown to the Imperium how many, and which Chapters were created, and if they still exist. This Founding is the only in which the [[Adeptus Terra]] does not possess the original gene-seed of the founded Chapters.{{Fn|9}}{{Fn|11d}}

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