I can say the villain can be a tribal leader that managed to unite the nomadic tribes? After uniting them he would lead the conquest of small kingdoms in the centre of the world, slowly crawling into larger kingdoms.
The protagonists can be a loose coalition of soldiers from the kingdoms trying to stop the hordes from conquering any further.
I suppose culture of the kingdoms can range from Asian to Europe, including some Middle Eastern, Central Asian and the Caucasus.
The protagonists can be a loose coalition of soldiers from the kingdoms trying to stop the hordes from conquering any further.
I suppose culture of the kingdoms can range from Asian to Europe, including some Middle Eastern, Central Asian and the Caucasus.