Right, sorry about the late Vote Closing, but my internet died for like an hour earlier.
So, while I write the update, here's something for the thread to chew on. I've been thinking about what boons Malice might grant his high-end followers in addition to access to Darkness and essentially at-will Daemon access. Keep in mind that the number of Malice followers is small even compared to Chaos, and the number that rise high enough in the ranks not to succumb to Darkness and become full-fledged Heartless is maybe 1%. Mostly because Malice has to husband his power carefully. Also, a given follower tends to only get to have the one, though Malice is at least willing to let them pick most of the time. His equivalent of Abbadon the Despoiler would get all four though.
There's Blending In, which is derived from the Tzenntchian Aspect, which molds the user's body to blend in with the world they're on. They'll look like a Khornate on a Khornate Dameonworld, and like an Ork on an Ork world. The major downside is that it's completely involuntary, so it can be a pain to have to deal with a different physiology every time they have to go to a world whose inhabitants are significantly different from their previous one.
Then there's Combat Experience, which is derived from Khorne and basically makes Leveling up an actual thing in-universe. The downside is that going long enough without killing something (Anything, it doesn't matter what.) leads to Level Drain, which weakens the combat ability of the follower proportional to the 'downtime' they have experienced, and hibernation of any kind counts. As you'd imagine, this makes infiltration missions a very arduous thing for a given follower, since they're obligated to not kill those around them when trying to learn about the world in question. It can also be a problem when working in large groups, because not killing something for a week or so makes the effect come into play.
Nurgle's essence is used for I Won't Give Up, which basically gives people Sus-An Membranes with a side helping of permanent regeneration, allowing them to survive lethal wounds and recover if not bothered for 15 minutes or so, as that's how long they take to recover from near-death regardless of the budget Sus-An. The problem being that Malice followers who get in that position tend to be one more solid hit from dying, and their enemies are not inclined to leave them alone for that long. Also, they can't give orders to their Daemons in this state, and Malice Daemons aren't all that given to caring overmuch if the head honcho dies, since they don't care much about anything.
Extract of Slaanesh is used in Master Of None, which increases the rate at which skills are learned up to the level of competence and negates skill loss below that threshold. This frequently leads to generalists who are just 'okay' at everything. This can let them synergize lots of skills, and do things like switch between a dozen different weapons without losing any significant skill advantages, but doesn't help much when facing an actual master of something. Say, a swordsmaster who, due to their raw skill, can fight you without major hindrance from the constant weapon-swaps.