Rubric of Ahriman
From Lexicanum
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The Rubric of Ahriman was the spell cast by the Chief Librarian Ahriman of the Thousand Sons Chaos Space Marine legion.
Prior to unification with their Primarch, in the earliest days of the Thousand Sons history, the Legion was constantly in turmoil, faced with the threat of mutation. When Magnus was found, the legion was afforded some stability and his training allowed control, and use of, their newfound powers. Despite these improvements all was not well.
It came to a head when the Legion betrayed the Emperor and joined the forces of Chaos during the Horus Heresy. They became the patron Legion to the Chaos god Tzeentch, Changer of Ways. Mutation began to spread rapidly, especially after Magnus' promotion to Daemon Prince.
Ahriman and his conclave of the mightiest sorcerers decided to stop the mutation for all time. They laid the foundations for a great spell that they believed would make their warriors pure for the rest of time.
The actual spell unleashed was so powerful that even the Daemons of the Warp shied from it. The Planet of Sorcerers was engulfed in a storm of blue and yellow lightning, striking down every Marine on the planet. Eventually Magnus intervened and stopped the spell.
The Thousand Sons who possessed psychic powers had them greatly augmented, however the majority of the marines who had little or no psychic powers had their physical bodies reduced to dust, ending the mutation but trapping their spirits in their armour. Every joint was sealed magically, and the only way for the soul to leave was to break through the armour. Magnus was enraged. The entire population of his army had been turned into bodyless automatons for all time.
Ahriman was exiled along with the rest of his conclave, and Magnus set about the conquest of the galaxy with his Rubric Marines, vowing to see the Imperium burn.
