It's pretty cool to go give him a gun & sci-fi bits. Some would argue this belongs more in INQ28 than Dark Age of Sigmar, but I think it could be fantasy as well. Dying Earth, Masters of the Universe, that sort of thing. And who knows, maybe the AOS world is the very very distant future of WH40K's Terra, long after the Emperor has died his final death, when technology has become so incomprehensible it is regarded as magic.