Religion is a biggy. There are major deities for each of the races already covered, and in that, there are many sub sects of each deity, specific deities, and whatnot.
The Chaos Factions, as I'm sure you know, have 4 Major Gods, and history had them with 5, and potentially even more.
Khorne, the Blood God. His followers worship him through the spilling of blood, and taking of skulls, be it enemies, other followers, or even there own. Also said that it's not just taken from those who offer the skulls up willingly, but from those who participate in battle, and enjoy it. Follows on through the idea that the Chaos Gods are formed from Emotion and Feeling of the Sentient Races, rather than from worship. His icon is a stylised skull, and an axe is typically the weapon of Khorne - this is doubly strange since the minor avatars (Lesser Daemons, Bloodletters) have swords, don't ask why, we're still trying to figure out what Games Workshop are playing at - and the colour is Red.
Tzeentch, the God of Change is said to be the most prominent Chaos God, currently. He is worshipped by those who Crave knowledge, and power. His sign is the Unblinking Eye, sometimes taken to be the Evil Moon, Morrsleib, or the Sun. His daemons take the form of an ever changing mass, spitting magical fire, or splitting up when damaged. The Larger Greater Daemons (Lords of Change) take the form of an Wizened Spell Caster with the head and gangly figure of a Bird of Prey. The Most Magically potent. THe pursuit of knowledge is said to further his supremacy, even the search for knowledge to defeat him leads to increasing his power.
Slaanesh is the God of Pleasure. Whenever anything is done for Personal Gain or Pleasure, such as Making Love, or selling your soul to him to become infinitely beautiful, to man, woman and beast alike, or even limitless power will provide him with worshippers.
The Last Major God is Nurgle, the God of Death. He takes the form of a Plaguebringer, creating new diseases. Whenever anyone dies, he gains power, from whatever means. He is different from Khorne, in that Khorne worships the actual Killing, rather than the dead bodies, which is what Nurgle wants. His followers are often ill things, with plgues diseases, and some of the worst mutations. However, they are often very tough.
The Last God is Malal, but he is no longer in the Pantheon, and is dedicated to destroying chaos. It was removed because the person who came up with the idea left GW and wouldn't let them use it. It is thought that the Daemon Prince Be'lakor is Games Workshops idea of it.
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