[X] Expose the Guilty. You cannot have enemies lurking unnoticed within your own priesthood. Prioritize identifying out the ones who have worked actively against you, and offer them the chance to repent before their peers.
I don't think we should execute the guy/girl, especially if they repent. But it's-
Part of how the Imperium got so bad wasn't that it compromised itself necessarily, that it was Insufficiently Hard or Lacked The Will but rather that it internalized and accepted an increasingly toxic, deeply corrupt environment, as not only necessary but desirable. It cultivated the fear, the paranoia, and the self-serving greed as not just unfortunate byproducts but the whole point of the process. There is nothing beyond our worlds but the endless, hellish dark. There is no hope, no alternative, no respite, so you Must Accept This as the only way. Your peers will report on you, betray you, sell you out and you never know who so you always must walk cautiously. Have to watch what you say and to who you say it. There is nobody here who will take care of you, who will look after you, save those you pledge yourself to and they, in turn, all must pledge themselves to the Imperium first and foremost. It drives this half-crazed, chaotic scramble for more, more, more, for some scraps of security and power within the rotting colossus, pleasure and insulation from the cruelties of the galaxy, and in the process entrenches and normalizes the mundane brutality of Human Space.
The person who betrayed us is...ultimately as much a victim of this system as a willing collaborator. It's that kinda thing you know where if you don't report first what happens when someone else reports on you. Where you're constantly having watch out for forming firing squads and making sure that you're throwing in on the right side. And ultimately purging this mindset, healing it, addressing it at least is one of the most important things I think we can do. Setting a hard line about how we're different, about how we're not going to tolerate this horseshit anymore, about how we don't want it.
Lancing the boil as it were.
Ultimately I want Ignatius to work on reforming this corner of space, this sector, making it a better place and exporting his version of the Imperial Cult. The Imperium's past the point where top-down control or reform is really possible I think and as the divisions deepen I want our slice of the stars to be...okay y'know? To survive. To be able to function autonomously, a sort of sub-Empire within the Imperium itself as the greater whole frays and comes apart.