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So a fluff question here. During the Great Crusade and the Horus Heresy it was stated that the Thousand Sons were the smallest of all the Legions numbering roughly ten thousand Marines organized into Chapter sized formations called Fellowships.

Fellowships one through nine are mentioned in the lore but the tenth is absent as far as I can tell. Is there any mention of them or is this just another oversight by GW?

There is a theory that they are the ancestors of 40k Blood Ravens. But that's all that I've ever heard of them.

That was mostly a make up of random companies in the fleet.

One of the fellowships was destroyed in a fight against Orks,

There is no tenth, as I understand. 9 is the sacred number of Tzeentch and I just assumed the only nine companies to be a shout to that. Much like mortarion s bodyguards having to be some number of seven paces away at all times.