The forces of Chaos can destabilise the very fabric of reality, pouring daemons forth as Heretic Astartes and Chaos Knights attack. Thus their foes frequently fight against a unified front of mortal and immortal warriors, manifested on the tabletop with the Daemonic Pact rules from Codex: Chaos Daemons.
So long as your CHAOS army includes just one* LEGIONES DAEMONICA Detachment, which accounts for no more than 25% of your total Power Level, every model within it gets the AGENTS OF CHAOS keyword. This allows you to ignore many Detachment Ability restrictions** when checking to see if everyone’s on the same team, just like Chaos Knight Dreadblades.
The ability to appear as if from nowhere makes daemons excellent shock troops, charging from tears in reality to seize objectives. This makes them excellent allies in Chaos Knights armies, where manpower is at a premium and Troops with the Objective Secured rule are valuable.
Certain Chaos Space Marine Legions have special bonds to the daemons of their own ruinous power. Khornate daemons readily join the World Eaters in battle without affecting their faction-exclusive abilities, likewise for Nurgle and the Death Guard, Tzeentch and the Thousand Sons, and Slaanesh and the Emperor’s Children.
While this removes your daemons’ control over Warp Storms, the ability to mix and match your units forges versatile armies. Allowing you to combine durable Space Marines, hard-hitting daemons, and stompy Dreadblades to tackle whatever the galaxy can throw at them.
What army combinations can you concoct, now that daemons can mix it up with their mortal mates? Find out by pre-ordering Codex: Chaos Daemons tomorrow, and create a diabolical horde for the glory of your gods.
* Mortal Chaos armies can’t quite stomach being outnumbered by their warp-spawned allies.
** Unless Be’lakor is around – his guys play by different rules.