After the failure of the [[Horus Heresy]], the newly-formed commune joined together with [[Ahriman]] to find a way to stop the mutation. They cast a mighty spell to counter the corruption. The [[Planet of Sorcerers]], the new world of the Thousand Sons, was arcing with violent blue and yellow streaks of lightning. They would strike down every Marine until Magnus had to intervene.

The legion had practically been destroyed, their bodies turned to dust and their armour sealed tightly shut. They had become automatons, and Magnus was angry. He ascended his tower in despair, and announced to the galaxy that he would see it burn.