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Hi people ! So right now I am a little bit confused about how the allies matrix, formations and this whole chaos supplement thing work. So I'll ask it plain and simple :

Could I take an army like this :

Main army (Black Legion CSM formations) : Black Crusade Detachment + Cyclopia Cabal

Allied army (KDK) : Gorepack.

?

Thanks for your time and answers.

Khorne Daemonkin is not a codex supplement. It is a standalone codex.

Well for starters you only have one army.
An army is either unbound or battle forged. I'm just gonna ignore unbound for now.
A battleforged army consists of any number of detachments and/or formations.

So a black crusade is a detachment. In parallel to that you could have a Cyclopia Cabal formation.
An allied detachment is a different kind of detachment. That would also exist in parallel to the crusade and cabal. Don't let the name confuse you, it's just a normal detachment. It has nothing to do with the allied matrix per se.

Some of those come with additional restrictions though, like the allied detachment. It has to be a different faction than whatever you designate your primary detachment, but you can still have as many as you want.

The allied matrix is of no concern to detachments and such. Those limitations only come into play on the tabletop, so you just need to be aware that the matrix might make life a bit difficult.

So yes, you could have an army consisting of a crusade, a cabal, and an allied KDK detachment.
Oh and you can apply the Black legion rules to the crusade detachment, but you can't benefit from the free VotLW for the cabal because that isn't part of the crusade detachment.

Here is the list of stand alone codices for Chaos:

Chaos Space Marine (CSM)
Chaos Daemons
Khorne Daemonkin (KDK)
-------------------------------------all are Battle Bros

Here are their Supplements:

Black Legion (for CSM)
Crimson Slaughter (CSM)
Traitor's Hate (CSM)
Curse of the Wulfen (Daemons and Space wolves)


You can indeed take the following as an army:
CSM detachment using Black Legion Supplement
Cabal formation from Black Legion
Gorepack formation from KDK

Remember that formations are stand-alone detachments and do not "fit" into Combined Arms or Allied detachments

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