[Update #2]: Immortal Empires has now been unleashed alongside Total War: Warhammer 3's biggest update ever!
[Update]: The second Champions of Chaos preview shows off Festus the Leechlord and the upcoming Nurgle additions.
The Warriors of Chaos were the very first DLC ever released for the original Total War: Warhammer. While they were alright back at launch, many years of updates and various improvements to the other races have left them so far behind that in Total War: Warhammer 2's Mortal Empires their world-ending invasion frequently gets stopped by a couple of random rats that just happened to cross their path.
So in order to make the Warriors of Chaos as fierce as they should be, Total War: Warhammer 3 will soon be giving them a massive overhaul. You can expect to see it arrive alongside the release of the Champions of Chaos Lords Pack and Immortal Empires combined campaign map on August 23rd, 2022.
Once the update arrives you will be able to promote your units through the ranks of Chaos - from the humble, half-naked Marauders all the way to the heavily armored Chosen. You can also dedicate them to a specific Chaos God by grating them a Mark of Chaos, which will not only change their stats and role on the battlefield, but their appearance as well!
This sort of promotion system applies to your heroes and lords as well, with each one being able to gain a bunch of even more powerful blessings. Best of all, if your Chaos Lords or Chaos Sorcerer Lords end up pleasing both you and the Chaos Gods, you will also be able to grant them the ultimate prize - the transformation into a Deamon Prince!
As for recruitment, the Warriors of Chaos will be able to instantly round up new forces from local provinces, and then further upgrade them via Chaos Gifts. These recruitments will be limited in scope, however, so while you'll be able to easily replenish your forces during an offensive campaign, you won't be able to just instantly get a fully-formed army of Chosen.
What all of this looks like in action, as well as what Slaanesh's contribution to the Champions of Chaos Lords Pack is all about, that you can find out through the preview below. Have a gander, it's one of Creative Assembly's better works:
If you prefer the written word, however, you can learn more about the upcoming improvements to the Warriors of Chaos, and Total War: Warhammer 3 in general, over at the official website. Enjoy!