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None of the Chaos models from FW seems to be applicable with the Khorne Daemonkin codex, if taken literally. For example the Blood Slaughterers of Khorne "can be used as a heavy support choice in a Chaos Space Marine or Chaos Daemons army". But since Khorne Daemonkin is technically a conglomerate of both CSM and CD (though not word for word) I should be able to use FW models. At least the Khorne ones...if not does this expand to a restriction on using them with Black Legion or Crimson Slaughter codicies too?

Khorne Daemonkin is a stand-alone Codex, whereas Black Legion & Crimson Slaughter are supplements for Codex: Chaos Space Marines.

FW models that can be included in a Khorne Daemonkin army specifically say so. For example, the Chaos Knight: "A Chaos Knight dedicated to Khorne may be taken in a Codex: Khorne Daemonkin army, and in this case has the Blood for the Blood God! special rule."
(https://www.forgeworld.co.uk/resources/fw_site/fw_pdfs/Warhammer_40000/Chaos_Knight.pdf)

If the FW rules came out before Codex: Khorne Daemonkin, it's probably worth asking FW directly.

Yeah, well the Blood Slaughterers are many years old, but worth having! Thanks man!

You can if you accept emails from FW. Check on 1d4chan to see what units are usable. There isn't any official support though. I have written them myself about this and they basically told me the same as what they say on 1d4chan.

there is this, it just an email response, so nothing really official, but its a start, you can always discuss it over with your friends and show them this.

FW recently said that they will release a FaQ for KDK and many other things, after they release their latest IA book, because they want to focus on the book release first before going for the FaQs.

Wich i find stupid as an excuss, cause you can always spare 4 guys to make a FaQ honestly without having any impact on the book release...

4 guys is pretty much everyone who writes at FW...

FW has been saying they will release an FAQ for like 3 years now. The Renegades and Heretics armies are full of typos and missing appendix entries, its horrid how much they left out. They even admitted to straight up forgetting about a unit (marauders) in siege of vraks!