Twitter discussion

[Famine0]

I recently re-read Stele #1 and saw this:

Our idea so far, or at least the idea most mentioned, is to use crusades and/or jihads to represent Migrations. With these some factions, most notably the Sweboz & Saka could launch “Jihads” into a province which represents migrations. It is just on the concept stage for now, but we will check if crusades require a Papacy faction or if we can use Jihads outside imams. On a sidenote, some of our factions will probably be made into Horde factions, so if they are defeated they can take their people and find other lands

So I was wondering how this idea has progressed? Any further information?