This proved to be his undoing: the Emperor was furious at the clear violation of his edict and formed a sanction fleet to return Magnus to Terra and hold him to account. Shortly after the Edict of Nikea, Magnus learned through the Warp of Horus’ treachery and sought to psychically warn the Emperor. While this affected most legions to some degree, it was effectively a repudiation of the entire fifteenth legion and forced them to withdraw to their homeworld. Sadly, this would not last the suspicion and derision of their fellow Astartes would come to a head and lead to the Council of Nikea, which resulted in the Emperor’s decree that the legions would no longer employ Psykers. As part of the Great Crusade, the sons of Magnus saw great success in bringing worlds into compliance through their mastery of psychic warfare and adept diplomacy. Magnus stabilized the gene-seed of his legion and for some time, it looked as though the Thousand Sons had a bright future.

Their unique gift also brought with it the curse of the flesh change, degenerative mutations that afflicted many in the legion and caused their numbers to dwindle rapidly until the arrival of their Primarch, Magnus the Red. This was a point of friction with several other Legions who looked upon psykers with suspicion or disgust. The XV Legion was uniquely composed almost entirely of psykers and their mastery of the psychic arts was unparalleled. Tizca, capital city of Prospero Credit: Games Workshop The fifteenth Legion of Space Marines, the Thousand Sons were pre-eminent warriors and scholars who claimed the world of Prospero as their own, where they built grand cities and libraries, and sought to understand the truths of the Universe. The Thousand Sons Who Are The Thousand Sons?Īh, the tragic tale of the Thousand Sons.

Horus heresy thousand sons