Well, considering how the Mod currently works the rise of the Kievan Rus up to the Battle with the Horde sounds like the good fit. The Horde Will be the Invading Force that you must defeat at the end in order to Win. It will be your chance to change history. Also, the period of the Horde occupation would be a good one. The Khan would be the King imposing his will and you must gain power enough to over throw him. Perhaps a Leader from each period can be a choice with each leader having a different Victory condition. Most of this is already in the mod. Yeah, this was the type of release, I had a long to do list left. But I'll be sure to make note of it. We don't have a "team and partners" enough to do this.