40k and fantasy have both borrowed literally from everywhere. Fantasy is itself (to a historian like me) completely unoriginal. It's various feudal countries/empires mixed with fantasy races.
Yet... it is also original to me because it's the only universe where Holy Roman Empire state troops ride demigryphs to charge into giant armored demon-men.
40k is likewise an amalgamation of classic sci-fi/fantasy/ and history. But it also gives it's own spin on it, making it unique in it's own way.
But we can ponder what is original all day long. Is Tolkein original? I don't think so. Almost all the races are from Norse or European mythology, all the countries are based on regions of Europe (Gondor = Byzantine Empire, etc) and any of the Godly and villainous entities are straight from Judeo-Christian mythology.
Anyways, to the original topic, I'm not really sure what is utterly GW's own invention. Skaven are pretty unique to me, so maybe them. But I'm sure someone can pull out an obscure novel from 1957 featuring ratmen.
To me it's just it's take on the universes and lores it's borrowed from that makes 40k unique, yet obviously familiar. I'll admit I have no interest in Dune, know nothing of it, but to me 40k was always and clearly the story of the Roman Empire and various historical bodies in spaaace. From the brief things I've read I can def see where 40k's Dune and Moorcock origins also came from.
Also, Orks are very different from other Orcs (minus the ever-present warlike culture). I believe GW created the concept of "giant, powerful, green-skinned Orcs" because before that Tolkeins were just weedy little cowards. After that Warcraft got Orcs popular again and those ones were inspired by Warhammer, not Tolkein.
I'll also point out that 40k Orks definitely draw inspiration from Mad Max.
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