Chaos Space Marines are Space Marines who betrayed the Imperium of Man to join Chaos. Most come from the Traitor Legions of the Horus Heresy, though some later chapters of Loyalist Marines ended up joining Chaos as well. Because their technology is limited to what was available during the Horus Heresy, they are at a technological disadvantage to the loyalists. However, they are compensated by using blessings from the Chaos Gods, as well as access to heretical technologies such as Daemon engines.
Traitor Legions Edit
Black Legion Edit
The Black Legion was known as the Sons of Horus during the Horus Heresy, but after Horus' death, Abbadon took over and remade the legion into a powerhouse for Chaos veterans. While others pursue their own agendas or those of their patron god, the Black Legion is committed to finishing what Horus started and destroy the Imperium. The so-called Long War had lasted 10,000 years and has comprised of 13 Black Crusades, with the final one succeeding in destroying Cadia and allowing the Eye of Terror to expand.
Word Bearers Edit
- Primarch: Lorgar
The Word Bearers are the most religious of the Chaos Space Marines, and worship all four gods as well as make ready use of daemons in their ranks. Their elites, the Gal Vorbak, willingly allow themselves to become possessed, while Dark Apostles maintain discipline by chanting from the Book of Lorgar.
Iron Warriors Edit
- Primarch: Perturabo
The Iron Warriors are brutal and calculating, and are among the best engineers and heavy weapons experts among Traitor forces. They despise the Chaos Gods, but hate the Imperium even more.
Night Lords Edit
- Primarch: Konrad Curze
The Night Lords terrorize their foes to such a degree that even rumor of their arrival will cause worlds to capitulate. They also hate Chaos and care only for destruction.
World Eaters Edit
- Primarch: Angron
- Members: Kharn the Betrayer
The World Eaters are murderous psychopaths that serve Khorne. Their Berserkers are often implanted with "butcher's nails" which effectively lobotomizes them to be unthinkingly aggressive. They mostly fight in close assault, wielding their signature chain axes.
Thousand Sons Edit
The Thousand Sons are lead by powerful sorcerers, with the rank-and-file Ruberic Marines being little more than dust entombed in armor. They are the pawns of Tzeentch, and will often find that their own schemes are subordinate to those of their God.
Death Guard Edit
The Death Guard are extremely resilient to all damage, especially their Plague Marines. They spread disease and decay in their wake in service to Nurgle.
Emperor's Children Edit
Once they were staunch perfectionists, but their obsessions lead them to pursue extensive body modifications and performance-enhancing drugs, until they became complete hedonists seeking their next high. They serve Slaanesh and specialize in sonic weaponry.
Alpha Legion Edit
- Primarch: Alpharius Omegon
This mysterious legion is known little of, even by other Chaos forces. They specialize in misinformation and employ a massive spy network. Rarely do they ever act openly.
Fallen Angels Edit
- Members: Cypher
The Fallen Angels were members of the Dark Angels who stayed behind on Caliban. Their leader, Luther, was unhappy with his position and sought to free Caliban from the Imperium, and stumbled upon Chaos in the process. Not all of the Fallen followed him, though, with some believing that they had been betrayed by Lion El'Jonson but still refuse to follow Chaos. Nonetheless, they are hunted by the Dark Angels to keep their existence a secret.