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The '''Thousand Sons''' were '''Legion XV''' of the original twenty [[Space Marine Legion]]s. Their [[Primarch]] is [[Magnus]], oft called '''Magnus the Red'''. The Legion turned traitor during the [[Horus Heresy]], after which it relocated to the [[Planet of Sorcerors]] in the [[Eye of Terror]] and dedicated itself to the [[Chaos God]] of change, sorcery and magic, [[Tzeentch]]. For a time it appeared that Tzeentch protected the Thousand Sons from the corruption and fragmentation that most of the other [[Traitor Legions]] underwent, but eventually the Legion went through a crisis of [[mutation]] and de-evolution, seemingly at the wish of their patron-God. Aghast Against at this development, their chief [[sorceror]], [[Ahriman]], cast [[Rubric of Ahriman|a powerful spell]] designed to render the Thousand Sons immune to the warping effects of [[Chaos]]. While the spell succeeded in this goal, it had an unforseen consequence of transforming the mutated Thousand Sons into little more than mystically animated suits of [[Power Armour|armour]] barely capable of being termed as anything more sentient than automata.^1a