Not sure to understand the whole thing (bad english ) but you seem to think of a fantasy world regarding human real life/history standards. So you're setting yourself the limits of it while your only limit should be your imagination. For me the interest of fantasy worlds is that you can broke those limits to create something strange/new/unusual and such. Cliches in fantasy just comes from a few lack of ability of imagining something different. Just my two cents (again sorry If I misunderstaood the post)