Astra Sparticus

The Astra Sparticus, known colloquially as the Spartans, is an Imperial adepta representing the three legions of Spartans that defend the Imperium of Andarra from any external and internal threats. They are immortal beings, genetically-engineered by the Holy Mother to serve her during the Great Crusade. In the early days of the Imperium, there were millions of Spartans roaming across the stars, conquering planet after planet in the name of their Imperial majesty, but those times are but a fading memory. Few remain after Galatan's Rebellion, where only four legions remained loyal to the Empress while the squabble beneath the Arch-traitor's feet as he launched a grand crusade against his own kin.

They are the Empress's Children, the mightiest warriors the galaxy has ever seen. They are humanity's greatest accomplishment, and they know no fear, only the bells of war.

Great Crusade
Every spartan can trace their lineage to the massive genetic labs stowed hidden away under the surface of Luna. When the Holy Mother united Terra under the banner of the Imperium, she set a course to humanity's first colony, for the gene-cults of Luna were rumoured to possess biological knowledge that surpasses Her own. A bloody campaign was fought against these gene-cults—one that lasted an entire decade, for every time Her mighty thunder warriors defeated the gene-cults in battle, they would simply dig deeper. Ultimately, Her campaign proved to be successful once the last of the gene-cults were integrated into Terra's bourgeoning domain. After a decade of brutal fighting, the Imperium sails the stars once more. There, in the deepest room in Luna, the Empress connected with the powers of the aether, breathing new life to Her creations—ten thousand genetically-engineered humans, injected with the fantastic powers of the aether. Then, the awakening. Galatan Oriona, leader of the Thousand Sons and future Warmaster of the Imperium, awoke from his slumber. For four hundred years, the Spartans paved the foundation on which the Imperium stands today. A million worlds were integrated into the Imperial fold