Light of the 40th century

So this is my first story really. it's just an idea. A reincarnation of a person from Earth with middling knowledge of 40k (just like me) and who has their soul fused with that of a Kryptonian was reincarnated in 40k. How does the world of 40k change when the son of the first hero is strutting around in the grim future of 40k? With knowledge from Krypton. That super duper multi-galaxy empire of superhumans. Pretty crack premise. I've seen very few Superman x 40k fanfics surprisingly enough. But then again I get it in a way. grimderp is grimderp. Superman doesn't fit. But I think it's interesting so.