Irbis wrote:

Sgt. Cortez wrote:
Well, I don't know exactly how Undead work in AoS, but in 40K you also have Zombies (Poxwalkers among others) at least. Necrons are basically Tomb Kings. And Thousand Sons are... also Tomb Kings I guess

Except these are not zombies. These are people possessed by Nurgle disease. About as much difference as between 17th century folk zombie, product of evil magic, and modern Hollywood one, created by science. As far as we know, nothing resembling AoS winds of magic exists in 40K, warp is one, not divided between 8 specific kinds of warp stuff. There are no animated skeletons or statues, no vampires, no ex-mortal gods, no dragons, no nothing.

Also, while technically 40K and AoS daemons are supposed to be the same, which is why they use same models, the AoS daemons suck. A bunch of spearmen in rags can stab a bloodthirster to death, good luck doing that in 40K. This is pretty much one of iconic bits of Fantasy art, just try to imagine 40K guardsmen clubbing KoS with butts of their rifles out of the trench:

Spoiler:

greatbigtree wrote:So, just to point it out, the Galaxy is enormous. If there’s an element fluff-wise you’d like to play with from Fantasy, in the 40k universe, it’s just your imagination to make it happen.

Beastmen as Guardsmen, Minotaurs as Ogryn, Centaur type critters as rough riders... Lizardmen as Orks, Skinks as Gretchin, bigger Dino’s as Dreadnaughts... Vampire counts as Eldar, using the “tough stuff” as Wraithguard? Maybe better as Necrons?

Point is, most models would have a reasonable counts-as between Fantasy and 40k, if you imagine Mutated versions of humans, or technology replacing magic (necrons) such creatures likely exist somewhere on a backwater feral world.

 Netsurfer733 wrote:
I saw that about the 8 different kinds of magic in Fantasy/AoS, but all of that *still* is derived from the warp. And in 40k, the warp effects different areas of space/realspace/warpspace/etc. differently. From what I understand, the way it fundamentally works in 40k is such that you end up with worlds that DO have worlds, sectors, continents, or even buildings that act and behave in certain ways, with certain rules of their own. Right? So to me there is nothing particularly *special* (GREAT though it may be) about Warhammer Fantasy/AoS having 8 specific kinds of magic. If anything, it just reinforces the idea that all such things WOULD be possible.

 kadeton wrote:
Incidentally, if I was going to use vampires and zombies in 40K, I'd run them as Necrons.

kadeton wrote:The main separation isn't so much of possibility (basically anything goes in either universe) but of genre. The expectations of each game's genre make certain elements easier or harder to accept.

AoS, being broadly Fantasy, is steeped in supernatural mysteries. There are gods, spirits, wizards, curses, etc. You don't need to explain how a necromancer manages to animate the dead, because it's magic. You don't need to analyse how a vampire's powers work, because they simply do.

40K, being broadly Space Opera, strives to give the impression that its phenomena are explicable. Plague Zombies aren't just the walking dead, they have a disease that alters their physiology and behaviour into something that just so happens to mimic the zombies of pop culture. Psykers aren't wizards who do magic spells, they're an expression of unique genetics that gives them conscious control over the energies of the Warp, a co-existent parallel dimension with different physical laws. And so on.

So to transition something from AoS to 40K, the only real trick is to reframe it in more genre-appropriate terms. So it's not a Vampire necromancer leading an army of zombies - that's far too out of place. But a mad tech-priest who self-experimented with forbidden Biologis techniques to extend his life for thousands of years but, due to an unforeseen side-effect, has to be sustained by a specific chemical only found in human blood... and whose technical masterpiece is the Galvanic Collar, a device capable of hijacking a subject's nervous system and moving them around like a puppet, even for a considerable time after the subject has died... well that's just dandy. It's all about how much effort you put into explaining things.

Incidentally, if I was going to use vampires and zombies in 40K, I'd run them as Necrons.

 Irbis wrote:

 Netsurfer733 wrote:

Though, now that I think about it, it's ironic Fantasy/AoS warp follows clear rules and does have user manuals / universities with cathedrals devoted to study of its aspects, while the 40K one is pretty much 'a wizard did it'. It kind of feels like they got it backwards and maybe they should be swapped. Dunno.

Even if that's not entirely true, since sure as HELL folks study it in 40k, just in a myriad of ways that are far less controlled and far more varied, thus why no set of investigations stands out - the thing to take away is that since there truly is no centralized understanding of the warp, it genuinely does fall into magic. It's just as unknowable 40,000 years into the future as it is in Warhammer fantasy, being the point.

Which brings me to greatbigtree's point...

greatbigtree wrote:So, to be clear, you're looking to homebrew a new codex? Or are you looking to "counts as" an existing codex and use "counts as" models to represent units from that counts-as codex?

In either case, the only real limit is what the people playing with you will put up with... for lack of a better term.