Grand Alliance: Chaos
Because leaving a job half-finished isn't his style (and to continue his streak of being more successful than some other prominent chosen of Chaos), Archaon the Everchosen returns on a cool dragon to give the middle finger to Sigmar and bring Chaos to all the Realms.
Beastmen minus named characters.
Chaos Giants. Same as normal Gargants, just a bit hornier.
Archaon and his Varanguard entourage.
Forces of the Great Horned Rat
The Clans Eshin -
The Clans Moulder -
The Clans Pestilens - Allies with Nurglites for the moment.
The Clans Skryre -
The Clans Verminus -
Blades of Khorne
Daemons of Khorne -
Khorne Bloodbound - Bloody Warriors of Chaos with bloody Khornate theme.
Maggotkin of Nurgle
Daemons of Nurgle -
Nurgle Rotbringers -
Disciples of Tzeentch
Daemons of Tzeentch -
Tzeentch Arcanites -
Hosts of Slaanesh
Split into Slaanesh loyalists, Archaon-worshipping daemons and factions of usurpers.
Monsters of Chaos
Assorted Chaos beasties. Also Centigors, for some reason...?
Slaves to Darkness
Classic Chaos Warriors and Marauders go here, with a fair bit of room to synergise due to being able to choose their deity keyword. Still technically includes good stuff like the Chaos War Mammoth.