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The main feature that distinguishes them from other legions is the amount of sorcerers they use in combat and their preferance to stay away from close combat.

After a crushing defeat by the Space Wolves during the Horus Heresy, the Thousand Sons allied with Horus and swore loyalty to Tzeench, Chaos God of Change. Soon after, the Sons started suffering debilitating mutations from their Chaos patron. The Chief Librarian of the Thousand Sons, Ahriman, devised a way to prevent further mutation, and in a powerful spell known as the Rubric of Ahriman, he disintegrated the bodies of the Thousand Sons, trapping their essence in their armour.

Ahriman's cabal was exiled to the Planet of Sorcery for his action, and now they seek out magical artefacts and talented psykers; their threat is so great that the Inquisition will sooner destroy a precious artefact than allow it to fall into Ahriman's hands.

The Thousand Sons' colors were red in the days before the Horus Heresy, and later became Royal Blue with gold trimming. Many Thousand Sons marines wear ornate crests on their helmets similar to the Burial mask of Tutankhamun.

Strangely, all Tzeentch-worshipping Chaos Marines are referred to, in game, as Thousand Sons, though clearly they cannot be they only Chaos Marines to turn to the Lord of Change.