This is a great thread that deserves a bump (because of another thread about a pre-heresy space marine on ice).
But one thing I have not seen hear is the fact that during the emperors time the geneseed was originally created by him/from him on terra no room for failure, or “inherently evil and traitors geneseed”.
(I think that’s hysterical that geneseed is inherently traitorous and “evil”. I could see that attitude after the imperium becomes more religious).
The geneseed didn’t rebel the primarchs did and then they used there charisma and power of leadership to manipulate there SM to also rebel. And of course the ones that didn’t rebel because they were so bad a$$ they didnt need no stinking primarchs, thats they had to be killed off (well they tried).
Also I think that the ad-mech doesn’t really see it that way, I’m sure they look at the geneseed for its quality and purity in the reference to be free from mutation and deviation in a biological way. I also think the ad-mech wouldn’t think twice about making chapters with geneseeds from traitorous primarchs, and they’re the ones who control it and experiment with it.
In the current fluff they already have supposedly loyal SM from traitor legions and I’m sure well see more of them in more of the stories.
I think yes there are new chapters are made with geneseed from a bottle called “other” and its filled with awesomeness.
I get this funny image of a Highlord of terra looking at this microscope in an ad-mech laboratory, and the magos is telling him about the awesome qualities of the geenseed and its perfection. Then the Highlord says “Hey these tiny little zit looking things look like tiny little faces, and by the emperor they look like Fulgrim. He then screws up his face like he’s looking really hard “ hey are they flipping me the bird!!, and I’m not talking about the sign of the Aquila, what the eye!!!” then the magos says” yeah, yeah.. dude you’ve been smoking way to much obscura, now get the hell outta here I have Astartes to make”…
Also the ad-mechs don’t divulge their secrets, plus they do whatever they hell they want.
By the way LightBringer I love the Beserk chapter idea, its totally cannon in my game.