So, could someone give me a primer on Proper Space Marine Procedure in a Renegade Chapter?
Apparently, your dumb Chaplain doesn't know it.
I mean, what exactly should I be doing with my Chaplain?
Why does everything I do get me investigated?
Seriously, WTF? Am I not entitled to participate in any way?
(There is no proper procedure for a Renegade Space Marine Chapter, as they are Renegades and beholden to none but themselves. Likewise with the chaplain, there's nothing wrong with a Chaos-worshiping Astartes, even one attempting to spread their corruption- as it is a staple for 40k- but your first move was to ask the Chapter Master to transfer 20 veterans from 7th company to 3rd company and 20 new marines for vice versa, which caused a vote from the Chapter Master/thread's perspective on what to do about that, as it's liokely something he would've done something about. There was then a roll to determine how the investigation went, with the chaplain failing to convince the Chapter Master he had nothing to hide on a 6 to the Chapter's 17, and then persuading him that his faith was uncompromised on a 19. After that, the chaplain was in the clear and could've done any number of things. He could've communicated with his less experienced battle brothers and slowly swayed them over to his way of thinking, he could've started weaving subtle messages of Ruinous praise into his regular sermons, he could've started outright used his sway to subtly start a cult in the Battle Barge's mortal crew and/or auxiliaries, he could've attempted to deepen his connection to Nurgle through prayer, he could've gathered rotting material to attempt a ritual of devotion, among any number of things, but he chose to write a letter to the Master of Sanctity, whose entire purpose in the Chapter is finding Heresy, who is the most knowledgeable of Heresy, and whose entire basis of holding the position is an extreme paranoia of Heresy, asking him which of the four Chaos Gods' main, positive portfolio aspects should and should not be emphasized, as well as asking about the state of the (correct) rumour of the Chapter wanting to find and train mortal psykers for their use, and implying that he wanted to take part in that. The only reason the Master of Sanctity hasn't immediately assumed Heresy is that the chaplain sent him, the Chapter's par-none number #1, Lectitio-Divinitatus-thumping, firebreathing, living-and-breathing-to-serve-the-Emperor fanatic, the letter, which makes no sense from a Heretical perspective. I have no bias for or against Heresy, but that is the reddest flag to be found outside of Khorne's war-room he could've waved in front of the Master of Sanctity.
Neither were metagaming, the Chapter Master absolutely would have investigated a sudden request for a troop-transfer from a company's religious councilor, and the Master of Sanctity absolutely would have gone to the Chapter Master to discuss a letter that's dripping with minor Chaotic influences. I'm genuinely befuddled why you thought that asking the Master of Sanctity to give his opinions on which Ruinous virtues, and following that with the rumour of psykers, was a good idea. On a sidenote, I would've accepted PMs of secret and/or objectionable actions here or on discord at any point, though I should've been more upfront about that, but nothing that anyone, from the Chapter Master on high to the lowest Zapgun in the mud, does is metagaming. I encourage anyone reading this thread to participate, and stress that anyone is entitled to participate, but that doesn't mean that the rest of the Chapter won't respond as makes sense, in-character, in accordance to their previously established personalities and lore, both of this thread and of the wider context in-setting. I've personally found the idea of a Heretic secretly attempting to subvert the Chapter an interesting additional layer- it could make for an excellent arc and/or recurring problem if it was planned well and/or sunk deeply enough and/or escaped, but... why would you start from the top-down, with a blatant power-grab for the 3rd company and then a blatant probe of which flavour of Heresy is most palatable for the Master of Sanctity? I just don't understand, man.)