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Looking at the fluff, am I correct that the following abomination is theoretically possible?

1) A Human gets impregnated by a Genestealer.
2) The 1st Gen Genestealer impregnates an Ork.
3) The 2nd Gen Genestealer impregnates a Tau.
4) The 3rd Gen Genestealer impregnates an Eldar.
5) The 4th Gen Primacii becomes a Magus, and gets corrupted by Chaos.
6) Blazing a trail of infamy, he eventually gets rewarded with Daemonhood.

Do we have a 6-way hybrid? (9-way, possibly, for Chaos undivided)

We can get more absurd, and have our hero get eaten by a Kroot, who then gets a Necrodermis bath, before becoming a Demon, but we're already in the realm of bargain basement fan-fic as it is!

No. Because the 1st generation hybrid is by-and-large human and probably won't have an ovipositor. Meaning He/She can breed with other humans (producing increasingly human 2nd/3rd gen hybrids, but not with other species.

The only cross-species stuff occurs with a purestrain.

Having a magus corrupted by chaos is fair enough, though - genestealer magii are psykers, and self-aware enough (outside the hive mind's influence) to give the dark gods a toe-hold.

I like this
I wonder what the result would look like though... And what kind of body and abilities it will have.

OK, the first problem is that to get a Purestrain genestealer out of human stock, it has to be at least fourth generation. That can be time-lapsed though.

The second problem is that due to Orks' spore-based reproductive methods, they can't create genestealer hybrids. All the oviposition would do is enslave the ork to the Genestealer's will.

Tau are potentially open for Genestealer infestation, but because of the super-rigid caste structure, they would have to work VERY hard not to be detected.

Eldar have no particular defences against Genestealer infestation, although their own psychic powers may render them resistant to the Genestealer's attempts to mesmerise them, meaning that oviposition becomes a challenge.

Chaos Genestealer cults are actually a thing already.

Kroot couldn't happen that way - Shapers can scent 'tainted' hybrid flesh and forbid their packs from feeding on it.

As others have already stated, a large part of that reproductive chain couldn't occur, based solely on how the Genestealers reproduce. That isn't to say that you couldn't bend the fluff a tad for the sake of storytelling, though.

 Furyou Miko wrote:
Chaos Genestealer cults are actually a thing already.

Going off on a tiny bit of a tangent, the official GW miniatures for Genestealer cults bore Chaos imagery pretty much right until they were entirely absorbed into the Tyranid army a couple of editions in. Here you can see the Genestealer Patriarch seated on a Chaos Star throne:

(by far my favorite Bob Olley sculpt, in fact possibly my favorite sculpt in general... but that's the topic of another discussion)

 Furyou Miko wrote:
OK, the first problem is that to get a Purestrain genestealer out of human stock, it has to be at least fourth generation. That can be time-lapsed though.

The second problem is that due to Orks' spore-based reproductive methods, they can't create genestealer hybrids. All the oviposition would do is enslave the ork to the Genestealer's will.

Tau are potentially open for Genestealer infestation, but because of the super-rigid caste structure, they would have to work VERY hard not to be detected.

Kroot couldn't happen that way - Shapers can scent 'tainted' hybrid flesh and forbid their packs from feeding on it.

Snipped down a bit for specific points.

My understanding of Genestealer infection was that it altered the host's genetic material so that reproduction leads to more tainted individuals. I don't think this is supposed to be limited to sexual reproduction, so an infected Orks spores should also be altered by the infection. I dno;t htink this has ever been ntoed in any of the background soruces, but equally I don;t think it has been specifically noted as being impossible. It would make ork-genestealer conflict on space hulks even more messy Certainly in the first iteration of the Tyranid army structure they had access to squigs along with various types of infested/controlled troops.

Also I don't see how the rigid caste structure of the Tau would increase detection rates. Individual Tau seem to enjoy quite a lot of freedom in their lives, rather than being strictly monitored every waking hour, so an infected individual is likely to be able to game the system. It might help protect against cross-caste infection, though.

While shapers are supposed to help protect their packs, you could propose a corrupted or renegade shaper, or even packs that have lost their shapers and get a bit hungry.

Ork genestealers were a thing in RT era and and have appeared in a few recent novels.

Tau/eldar reproduction (especially between castes) is strictly monitored so hybrid broods never get too far in their culture.

 Flinty wrote:

Also I don't see how the rigid caste structure of the Tau would increase detection rates. Individual Tau seem to enjoy quite a lot of freedom in their lives, rather than being strictly monitored every waking hour, so an infected individual is likely to be able to game the system. It might help protect against cross-caste infection, though.

While shapers are supposed to help protect their packs, you could propose a corrupted or renegade shaper, or even packs that have lost their shapers and get a bit hungry.

I'm apparently wrong about Orks, so OK.

Tau raise their children in communcal creches - parents never have a chance to hide their corrupted spawn away because they children are removed from their custody the moment they pop out.

Yeah there are Genestealers orks in Redemption Corps.

The rest of that book was so terrible I must have blanked them.

Big Spoilers for the Ciaphas Cain novels:

locarno24 wrote:
No. Because the 1st generation hybrid is by-and-large human and probably won't have an ovipositor. Meaning He/She can breed with other humans (producing increasingly human 2nd/3rd gen hybrids, but not with other species.

The only cross-species stuff occurs with a purestrain.

Having a magus corrupted by chaos is fair enough, though - genestealer magii are psykers, and self-aware enough (outside the hive mind's influence) to give the dark gods a toe-hold.

Has that changed, then? Originally 1st and some 2nd generation hybrids did have ovipositors, so I suppose they could infect another species. However, by this point, presumably the instinctive imperative to form a cult has kicked in, so such Hybrids will be looking to infect more of their local population, rather than random aliens (meeting one would be massively unlikely anyway). It was also mentioned that some Hybrids would have to rely on in vitro methods of reproducing, since they lacked an ovipositor but were too heavily hybridised to breed normally.

As for Chaos, originally it was discussed that some Cults turned to the worship of Chaos out of desperation, or as a shortcut to power - in much the same way that uninfected humans do. At that point, the link to the Tyranids didn't exist, although there was a minor "Genestealer Power" in the Warp; perhaps a precursor to the idea of the Hive Mind and the Shadow in the Warp.

Tau raise their children in communcal creches - parents never have a chance to hide their corrupted spawn away because they children are removed from their custody the moment they pop out.

This assumes it's not the creche managers who're infected. Genestealers are adaptable...