See also: Troll
All trolls are the result of thousands of years of warping influence from the corrupting power of the Realm of Chaos, and so it could be said that they have all been affected by Chaos to some extent. Chaos Trolls, however, have been altered by the power of Chaos more directly. They sport all manner of mutations, making them even more hideous than their common cousins, and the power of the winds of magic stokes their natural aggression and strength, turning them from mere monsters into some of the most terrible beasts in the armies of Chaos.
Warriors of Chaos receive Gifts of Chaos, permanent mutations that may help them in future battles for their Chaos god. If the warrior receives too many gifts and is unable to endure any more, he can become a Chaos Spawn. Alternatively, a Spawn could simply be a warrior who has spent too much time in contact with the warping power of Chaos, and has mutated without direct action by a Chaos God. A Spawn is a wildly mutated beast and is generally insane or non-sentient, living the remainder of its existence at the whim of its god or its fellow warriors, killing everything in its path.