On rare occasions, the Chaos Gods will direct their forces to work together to meet a mutually beneficial goal or defeat a common enemy, but such events are only temporary respites from the eternal competition that defines them. Most of the time these forces are content to crash against each other within the Warp, but daemons also exult in the chance to bring their corrupting influence into the Materium, and will answer summoners' calls for aid, exploit an unskilled sorcerer's lapse in concentration, or charge en masse out of a Warp rift to bring the madness of Chaos to another world. The Dark Gods' armies in this war are their legions of daemons, fragments of their own power given form and freedom to murder: reflections of primal emotions, machines that do not obey physical laws, childhood nightmares, all have a place in a daemonic horde. The interplay and incompatibility of these concepts leads to a great rivalry between the Chaos Gods, the 'Great Game,' an eternal conflict that consumes the Warp and spills over into the material universe. The Ruinous Powers are often labeled as unfathomably evil, embodying Rage, Decadence, Despair, and Ambition.

Though incalculably powerful and gods by every measure of the word, they are by their nature monomaniacal and single-minded in perpetuating the concepts they embody. The Chaos Gods are the personifications of the thoughts and emotions generated by living creatures, given sentience by the psychic energies of the Warp. The Greater-Scope Villain of Warhammer 40,000 is Chaos, and the four greatest Chaos Gods ( there are more, but they aren't nearly as powerful or well known) - Khorne, Tzeentch, Nurgle and Slaanesh - are the faces of that evil, the incarnations of humanity's vices and perversions of its virtues that would see the material universe torn down and replaced with seething madness. And with the mighty axe of Khorne, we cut open the world for them.' With the twelve plagues of Nurgle, we fell their enemies.

With the thousand whispers of Slaanesh, we call to them. 'With the thirty-seven keys of Tzeentch, we open the way for our brothers.

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