After Magnus decided to join forces with the Warmaster in the Siege of Terra, the Thousand Sons fate was sealed with servitude to the forces of Chaos. As they fell into the powers of evil, they begun to believe in their own lies and deception; convincing themselves that instead of them being used as puppets they were actually in control of their own destiny. How wrong they were. The Cursed Brotherhood have adorned themselves in white power armour, a symbol to their brother traitor legions of their own enlightenment.