You said ask this on SV:
So I will! Mind explaining this further in a kinda comprehensive breakdown. Aka the analysis on Baldur's interaction within and without the legion. The psychological dossier on Baldur. The projects. His view in Baldur, etc?
I'd most definitely appreciate it boss! Whenever you got the time!
Alright so for Baldur he's one of the heroes of yours that has what I refer to as background actions. These effectively make up background fluff, but periodically have effects that can reach your level of abstraction. Maticus for example has improved the 3rd company to the point that it'll be breaking up for the Ritual and having its Sergeants make up the leads of 10 of the kill teams. As for Baldur, he's mainly focused on the diplomatic and intrigue parts of the Wardens, although he's been focused on projects that don't affect the Legion as a whole out of necessity as it simply doesn't get together all too often.
For Oriacarius himself, he's a paranoid man, and has spent his background actions compiling dossiers on a lot of your characters. For his dossier on Baldur there's four main parts of it. His interactions related to the Legion, interactions unrelated to the Legion, the psychological dossier, and a series of contigencies for if he would go rogue.
For Baldur's interactions within the Legion, Oriacarius didn't quite interrogate the Wardens, but he did essentially debrief them as if they were on an undercover mission. There he formed an analysis of Baldur that paints him in a semi-decent light. He's one of the older Wardens and other Astartes come up to him for advice from time to time. Generally Baldur gives them some pointers but warns them that he developed his skills in a manner that many of them won't actually go down. There's also his advice on cost-benefit, where he paints a more callous viewpoint than Maticus' training does. It's something Oriacarius is unsure what he thinks of it, but everything he's checked says there's nothing to worry about, so he's only added his normal contingencies.
For his interactions without the Legion, Oriacarius has a more complicated set of folders due to who Baldur interacts with. His exchanges with Malcador are simply something Oriacarius isn't allowed to access which grates on him. He's accepting of it as he understands the reasoning, but he certainly doesn't like it. His exchanges elsewhere though are easier to track. They mainly tend to focus around Baldur's projects concerning the diplomatic teams within Kesar's domain. He's essentially been working on collating the analysis of all compliances and then using that to find ways to improve the system. It's a complex project and one that's expected to take a while, but he's slowly working on it. That and also using it to slowly put moles within it that report to the Wardens in case it's needed. Oriacarius has loose ties to the people Baldur has interacted with, mainly just knowing how to get in touch with the less important ones and exchanging letters with the more important ones. The latter project of reporting to the Wardens though is something Oriacarius is actually interested in and tacitly supports.
For the psychological dossier, this is something I tend to keep more abstract as I'm not a psychologist. But for Baldur it tends to focus on his ruthlessness compared to other Wardens. He certainly doesn't waste lives, but he's far more callous about expending them than the Legion normally is. This leads to a psychological dossier that is more developed than the ones for other heroes as Oriacarius' paranoia kicked in. Essentially it's an analysis of his past compliances, projects, and interactions that covers why he made the decisions he did. Essentially it comes down to Baldur being more ruthless than other Wardens and being less loyal to Kesar personally than the other Wardens. It's for this reason that Baldur is tasked with a key part of the Godslayer contingency that will trigger if Kesar joins Chaos.
Lastly there's the contingencies for if he goes rogue. These tend to focus on cutting off Baldur from external contact and ordering him to be taking down quickly and at once. He's to be kept silent for the duration of the capture and the team that does so is chosen to be one of veterans that haven't interacted with him. Additionally it covers neutralizing his contacts outside the Legion in case he's set up a spy network for hostile powers. This involves working heavily with Malcador while deploying Astartes teams to the various sites. There's definitely more to it, but I like to keep this somewhat abstracted since Oriacarius is much better at this than I am.