So. Much of the cultural stuff of Yon's homeworld is rapidly becoming obsolete... but there is still culture stuff here that we can get interesting information off of. Obviously, there's the heavy dollop of WH40K Chaos stuff, but that's not the interesting thing. The interesting thing is how they approach Yon's homeworld., and their attitude towards cultivators.
First? Cultivation is rare, in the wider universe. They have a facility and a group intended specifically too intake cultivators, and the cultivation part is given essentially no respect as cultivation. They're being fed gruel that has been carefully tweaked for nutrition, but it has no qi... and qi in foods was plentiful enough back at the sect that Yon notices this and immediately catches that it is odd. The people training them have no cultivation, have zero respect for the cultivation of heir charges, and call them savages. If this were a universe where cultivation was a thing broadly, that would not be the case.
Second, following off that, you can pretty much guarantee that the folks in charge at the Celestial Envoy level know about cultivation and its value, and are reacting accordingly. "Ascending" may well be a process of becoming a greater demon, and thus able to step into the warp directly - especially for those who are choosing to emulate the gods as a part of their cultivation. The Celestial Envoy seems pretty clearly to have been some manner of cultivator himself, if an impossibly powerful one. That's why inner disciples and above get more control over where they are assigned - because at that level, their cultivation is enough (on average) that they might be worth respecting for it (a little). Meanwhile, back down with the Outer Disciples, we're basically just bog-standard human infantry with a few random stat bumps and lousy initial BS. The best way to make use of us is to break us of all of that cultural baggage, send us through training to give us basic soldier skills, and throw us at the enemy.
Third, following off of that... the technique and resources that make cultivation go are likely to be hard to get at our tier, and not just in the ways they were hard to get back at the sect. The inners and up might be important enough to have our overlords willing to provide them with arts to hone their weird and special powers, but we are not so special. If we ever want to get more techniques than we have right now, we'll likely either have to figure them out for ourselves, hook back up with the inners... or somehow convince our peers down here in the dirt to trade them back and forth. That last one seems pretty unlikely, but isn't necessarily impossible.
Now, in some ways this is as much a boon as it is a bane, because those same overlords aren't going to be particularly inclined to provide standard alchemical supplies or recipes... which means that our skillset is still valuable to our peers. A very small number of the best will be taught the ways of Chaos Faction medicine by whichever expert it is (and we should at least shoot for that) but "kill weird beasties and grind them into pills to power your cultivation" is WoQM-declared to be part of this, and they're going to need people to do the pill-grinding part of that exercise.
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As far as skills? I don't feel like that QM is going to hand us any utter trap options here, when it's explicitly decisions that someone else is making rather than decisions that we are making. Sending us into a "pick your skills" where one or more of them were plot-defined to be obsolete in short order seems like way too much of a trap option. We need to get good at fighting... which means we need to pick a fighting style. Right now, Yon's fighting style is "Very durable, and sort of okay with his fists". We can go just about anywhere from there. Essentially, this is in part a "pick your fighting style" vote. Assault would be the "traditional chaos warlord wannabe" route, but I don't think that one has enough support to win. I'd like to have us doing at least one of the four, because combat challenges will be coming, and I want to have some combat skills when they do. I think that the idea of playing Necromunda-stule Heavy is pretty cool, and I want to go for it. I suspect that if they choose to throw us into the arena to fight the monster of the week for grins and giggles, they'll let us bring along our weapon of choice.
Oh, another thing - the specials? That's Yon training on his own. Every other one of these is Yon getting specific training from someone who knows that they're doing. There's a nonzero chance that that training is just straight-up less efficient than the other training, in addition to getting less respect.