Nah. Look at total war: warhammer and how they keep pulling and pulling named characters from all over the place, adding and changing things as needed (all with the approval of GW, granted, but their complete creative liberty otherwise). Books, novels, army books, small paragraphs in a goddamn white dwarf magazine. If they want to, Creative Assembly talks to GW, they discuss how to best do it, and they do it.
What could be the case (and I’m not sure, only game devs that have worked with GW would know) is that you need to purchase a bigger license for that.
From what I’ve heard/read, part of the reason why there’s so many warhammer video games is because GW has this thing where you purchase the license exclusively for what you need, not for the entire IP. This is cheaper for the developer, because you just buy what you need, but if you eventually want to do more and it goes out of your license, you need to buy the license for that other thing, too.
Tis jus...
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