The Best Warhammer 40k Chaos Space Marine Chapters

The Iron Warriors' specialty was the breaking of sieges and assaults on static fortifications, which made them great rivals of the Imperial Fists Legion, which was said to construct the greatest static defences in the Imperium. It was this rivalry between the Legions, and between their Primarchs Perturabo and the Imperial Fists' Rogal Dorn, that helped turn the Iron Warriors to Chaos.

The main feature that distinguishes the Thousand Sons from the other Traitor Legions is the sheer number of psyker mutations that have always existed amongst the Space Marines in this Legion. Every current member of the Legion possesses psychic abilities and they prefer to use Chaos Sorcerers and guile in combat, relying on their psychic powers and sorcerous knowledge to earn them victory.

The World Eaters are the dedicated servants of the Blood God Khorne, the Chaos God of War and Murder, and live for nothing more than to spill blood in his name. The World Eaters' Primarch, Angron, was one of the first of the Space Marine Primarchs to join with the Warmaster Horus when he turned against the Emperor and began the Horus Heresy.

The Alpha Legion is the Chaos Space Marine Traitor Legion about whom the least is known. They are experts in infiltration and their armies contain many Chaos Cultists in addition to regular Chaos Space Marines.

The Death Guard are one of the Traitor Legions of Chaos Space Marines. They worship and devote themselves exclusively to the Chaos God Nurgle and as a result of his mutational "gifts" they have become Plague Marines; Astartes who are eternally rotting away within their Power Armour and infected with every known form of disease and decay but who are immune to all pain or minor injury.