Cheers guys
I'm going to go with a Tzeench Kingdom instead due to that one being more likely to last.
In my eyes this Kingdom would be a parody of the King Arthur style Kingdom with the King actually being a powerful Tzeench lord who ascended to daemonhood during the destruction of the old world. The Elites of the army would be what survived of his original forces while the marauders and chaos warriors would be created in the new world