Slaves to Darkness are the mortal followers of the Chaos gods, from barbaric warriors riding across burning plains or hidden cultists plotting the downfall of their own city. Their Tribes are the most prevalent human culture in the Mortal Realms, with many of them numbering in the hundreds of thousands.

On the battlefield, the Slaves to Darkness are a highly varied army that ranges from waves of lightly armoured raiders to disciplined ranks of ironclad warriors, speckled with all manner of powerful wizards, champions and daemonic beasts. Some warbands dedicate themselves to the service of one god in particular, such as the Bloodmarked of Khorne, while others follow in the footsteps of Archaon himself.