The Thousand Sons: A Powerful and Complex Traitor Legion in the Horus Heresy and Beyond.

The Thousand Sons were originally a loyalist Space Marine Legion created by the Emperor during the Great Crusade. They were known for their use of psychic powers and were led by their Primarch, Magnus the Red, who was himself a powerful psyker.

During the Horus Heresy, the Thousand Sons became embroiled in the conflict due to a series of events that began when Magnus used his psychic powers to warn the Emperor about Horus’ betrayal. The Emperor was outraged that Magnus had used forbidden sorcery to contact him, and sent the Space Wolves to bring Magnus to Terra to answer for his actions.

The Space Wolves attacked the Thousand Sons’ homeworld of Prospero, leading to a devastating battle that resulted in the destruction of the planet and the majority of the Thousand Sons Legion. Those who survived were mutated by the power of Chaos, turning them into the Rubric Marines.

The Rubric Marines were powerful sorcerers who were bound to their suits of armor, which prevented their physical forms from degenerating into dust. The majority of the Thousand Sons Legion became Rubric Marines, and they continued to serve Chaos throughout the Heresy.

Although the Thousand Sons were a Traitor Legion, they were not entirely aligned with the other Traitor Legions. They had their own goals and objectives, and at times they even worked against the forces of Chaos. For example, Magnus tried to warn the Emperor about Horus’ plans, and the Thousand Sons were known to seek out knowledge and artifacts that could help them better understand the nature of the universe.

After the Heresy, the Thousand Sons continued to serve Chaos and became one of the most powerful factions within the Chaos Space Marines. They have continued to seek knowledge and power, and are known for their use of sorcery and manipulation of the Warp. Despite their powerful abilities, however, the Thousand Sons are still haunted by the events of the Horus Heresy and the destruction of their homeworld.

Even after the Heresy, the Thousand Sons remained a complex and multifaceted faction, with their own beliefs, traditions, and agendas. They often clashed with other Chaos Space Marine factions, and were also opposed by various Imperial factions, including the Space Wolves, who held a deep-seated grudge against them for their role in the destruction of Prospero.

Despite the challenges they faced, the Thousand Sons remained a formidable force within the Warhammer 40,000 universe. They continued to seek knowledge and power through the use of sorcery, and were known to engage in complex schemes and manipulations to achieve their goals. Whether fighting alongside other Chaos factions or operating independently, the Thousand Sons remained a force to be reckoned with, and their story remains one of the most fascinating and tragic in the history of the Warhammer 40,000 universe.