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Whilst reading the topic on the blood ravens it made me wonder, is it possible to create a space amrine from 2 different founding chapters/legions?
I know theres 2 progenoid glands but is it stated anywhere that they have to both be from the same source?

If possible I imagine it would be a way of stabalizing unstable geneseed

We have had this discussion before. The 21st or 13th founding. Ending: Calamity due to unforeseen circumstances.

Only one progenoid is implanted per Marine. The Marine then grows two so he can replace himself and spawn another Marine to make up for casualties whose geneseed was destroyed. The geneseed cannot be mixed in an individual, but a chapter could be pieced together from different geneseed sources. For example, some members of the lost legions were (maybe) integrated into the Ultramarines, so the Ultramarine lineage (maybe) contains geneseed that did not originally derive from Guilliman.

Bludbaff wrote:
For example, some members of the lost legions were (maybe) integrated into the Ultramarines, so the Ultramarine lineage (maybe) contains geneseed that did not originally derive from Guilliman.

This was speculation from a random Word Bearer and the author of the novel has repeatedly denied the veracity of the idea.

I appreciate that you put maybe within your comment, but its all-but-certain that the Ultramarines were the strength they were because of the size of Ultramar, rather than as a result of the missing Legions.

Not just the size of Ultramar, but also because they were so far away from Earth when the Heresy began in earnest, they didn't suffer the losses the other Legions did.

The Ultramarines were the largest Legion before the Heresy because they were the most efficient, which makes sense when your Primarch's speciality is organization.

They suffered horrendous casualties during the Heresy against the Word Bearers and World Eaters; the Warp storms that made things so difficult for the Imperium was spawned by their blood.

There is only one explicit and irrefutable source on this. That is the words in Origins of the Legiones Astartes.

Every organ grows from a zygote, and a progenoid gland contains one zygote for each organ.

When a new chapter is founded, the Mechanicum select a single zygote for each organ (enough to make one marine) and reproduce that set of zygotes to make enough for a whole chapter.

This is all the article says on where a chapter's gene seed comes from. You could decide that means using a larraman's organ zygote from an Invaders marine and a melanochrome organ from a Minotaur, etcetera. However, there is nothing to suggest that this is successful or desirable.

As far as I'm concerned, if you took a blood angel Progenoid, and implanted it into say.. A Dark Angel recruit, and he was trained as a Dark Angel, you'd still have the same effects.. The Black Rage, Red Thirst etc.. But you'd have the tactics, combat efficiency and veneration of the Dark Angels, if that's what you're trying to get at?

Hybrid chapters are possible in the sense that individual members may have geneseed from different Chapters (Relictors' geneseed was taken from both DA and Ultras stock, IIRC).

Honsou was created from splicing genes from Iron Warrior and Imperial Fist stock, so it is possible, but this was done by Fabius Bile, so out of the reach of Imperial geneticists even if such research wasn't banned.

I think you could have a hybrid chapter, but to make it work you'd have to give them some pretty huge flaws at a minimum they'd have to have all the flaws that the 2 parent chapters have.

It's hinted the Minotaurs chapter has "Chimeric" geneseed, so it could mean there a hybrid chapter...