None, but there’ll be an achievement only possible for high-COM tinkers. 
I haven’t written that in yet, but I’ll give it some thought.
Indeed. Everything I say makes sense to me.
It wasn’t particularly centralized – very much a premodern empire, without the “techs of Theurgy” (in comms, transport, and agriculture) that have allowed the Hegemony to look more early-modern or precociously industrial.
The Erretsins were dissolute, unreliable cousins, the Karagonds were an odd smattering of impoverished city-states respected for their religious and intellectual prowess, the Whends and Neres were barbarians.
I’m holding off on pinning down the full history of Aekos, except to note that it was the site of the gameworld’s equivalent of the Delphic Oracle.
In general Xthonism is like a Christianity sans Messiah, with Aristotle’s Unmoved Mover as God and a law code that resembles medieval canon law rather more than Torah. In practice it looks like the Christianity rendered by highly imperialistic, power-friendly interpretations in our world, though like any religion it includes an undercurrent of subversive values that allow for it to criticize and transform itself. I’ve also said elsewhere that:
In terms of values, the Shayardene Codex does include the strong emphasis on humility and compassion toward the lowly and oppressed that Christianity learned from Judaism (and which is so totally alien to pre-Christian Greek or Roman mores).