Thoughts on the Politics of the Region:
The Telepathica:
The fact that they are here either indicates that this world was more central to local imperial rule than seems apparent which would indicate that imperial control shattered across a large area, multiple sectors at least or there is a nonadministrative reason for putting a Telepathica campus here, maybe the pet project of some radical Inquisitor, ambitious Rogue Trader out for profit, Arch-Magos looking for an out of the way to study psy-tech etc... Really given how many groups there are with something to hide in the Imperium, especially when it comes to the study of the Warp there is no lack of potential culprits.
Cutting themselves off is... sensible given the prevailing imperial sentiment to psykers and the fact that the rebels would have less reason than normal to follow the law, though the fact that they have not starved in those monasteries and especially that they are still taking in acolytes indicates there is some kind of agreement with the governments of the five nations. That is a pretty good sign in one sense because it means that the people in charge are inclined to be practical and rational when it comes to psykers, but it's a bad sign in another because it indicates they are hedging against a return of the Empire. Personally I think they are being too optimistic. The amount of war crimes likely to be inflicted on Denva as it is brought back into compliance would be far more dependent on who happens to be doing the purging than what they did in the interim. Hell if they get someone too puritanical I could see 'psykers allowed to run loose for more than a century, kill them all just to be sure'.
Also the fact that the locals are doing something with their psykers that isn't a generalized purge is a hopeful sign that they do not have cults running around at high levels. The reason a lot of rebelious realms end up falling to chaos is a combination of desperation in the face of Imperial revanchism and the fact that most of the people who even know what Chaos is much less how to fight it tend to be at the high levels, i.e. at the ground zero of the nuke that killed off House Denva in this case.
When it comes to stuff we can give them, warp shielding. Seriously this thing is the holy grail as far as the Telepathica is concerned, if only they would trust us this is the kind of thing Imperial psykers would if not sell their souls for then sell someone else's soul for. In essence that is the deal they have going with the Emperor who they 'know' as a matter of doctrine hates them. Vitan can provide better protection from having their souls eaten than the Emperor on distant Tera can give them and she is also not an asshole about it.
The Ad Mech Enclaves
When the rebelion started these guys actively decided to stay out of it, other elements might not have, but something tells me they were also at ground zero of a nuke so not really our concern anymore. I think they too are limiting contact as a kind of hedge against imperial return, but their situation is also more precarious than the psykers. The enclaves provide all kinds of valuable goods that the rich want and they are also the keepers of tech that the general populace know could improve their lives which they are being denied. It really would not take much for one or more of the nations to start a war against them unless they too have leftover Imperial WMDs. That question is vital to their overall motvation:
If they do not have WMDs than they are pretty desperate, looking to either make some, which is hard since innovation is not welcome in their theology, or call out to the Empire at large. They could for instance try to send a sub-FTL ship to the nearest system if they still have space lift capability. This is in some ways the ideal situation for us since Vita comes bearing gifts
If they do have WMDs than it's a waiting game that they have every chance of winning, since tech priests will have a lot more technical know-how to keep the weapons operational than the five nations. In that case the civilian leaders on the other side may be looking for a leg up in the long run.
The Five Nations
The fact that they maintain a pact to work together against external invasion indicates that the rebelion wasn't too traumatic, we are not dealing with people calling the other side heretic and accusing them of eating babies which is generally good, the fact that they are democracies means we can expect base levels of competence 'enough to get elected', not say Grigorious Aleksander the XXVth whose never been outside the family estates and pleasure gardens or the like, but it also means they will be beholden to public opinion. We need some way to reach out not just to the elites, but to the general public to make sure some rabble rouser does not rally support to kill the Abominable Intelligence. The elites are going to want Juve Nat, no question, the population are going to want their standard of living back, they know that they are living with sub-par tech right now.
