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Membership within these cults was determined regardless of the Fellowship (Chapter) to which each Astartes belonged within the Legion since cult membership was based upon the psychic ability for which a Thousand Sons Astartes displayed the most affinity.Įach Fellowship of the Thousand Sons was usually made up of Astartes coming from all five of the cults within the XV th Legion, though it was not unheard of for a Fellowship's membership to be dominated by the members of just one of the cults.
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The Legion used these five different cults to develop and improve the abilities of the often powerful psykers found amidst this Legion's ranks.
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Though some Thousand Sons Astartes never developed any measurable amount of psychic ability after being implanted with the XV th Legion's gene-seed, the majority did develop some form of psychic ability just like their Primarch Magnus the Red soon after completing the transformation process. With this new Legion structure, the sorcerers of the XV th Legion delved more deeply into the true secrets of the Lord of Change and were guided by the will of their Daemon Primarch, Magnus the Red.Ĭhief Librarian Ahzek Ahriman, Magister Templi of the Corvidae Cult.
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The Thousand Sons, like some of their fellow independent-minded Astartes Legions, employed a non-standard organisation within the XV th Legion that were known as "cults" and into which every Astartes was placed based upon their level of psychic ability.Īfter the fall of the Thousand Sons to the service of Tzeentch during the Horus Heresy and the transformation in the Legion wrought by the casting of the Rubric of Ahriman, the five cults of the original Legion became nine. The Cults of the Thousand Sons represented sub-formations composed of potent psykers within the Thousand Sons Space Marine Legion first created during the Great Crusade era who specialised in certain psychic and sorcerous disciplines. The Sorcerers of the Thousand Sons Traitor Legion's cults combine their powers to unleash a great magical working.
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