Warhammer 40K: Oathbreaker Knight

The Siun family is said to have originated in a region called Bashulia, in Terra's Dragon Kingdom. Their surname may be an archaic Gothic expansion of an ancient script. During the later Golden Age, the Siun family successfully seized control of a world called Galisto. By the time the Imperium discovered them, they had already established a miniature interstellar empire. Inspired by the Emperor's grand vision and eager to join Terra's true nobility, the family officially changed its surname to Siun to fit Terra's naming conventions. During the Great Crusade, the family forged an alliance with the Godbreaker Titan Legion and also established close ties with the Luna Wolves and Dark Angels Legions. During the Horus Heresy, they followed Warmaster Horus and won great renown along the way, descending into corruption and decay amid their unending victories. When the Horus Heresy ended, the family had been reduced to less than a tenth of its former strength, and the Imperium declared it dissolved. Yet ten thousand years later, in the Kronos Expanse, a knight of the Siun family appeared once more in the sights of the Imperium and the rebels. This last son decided to wage a war all his own.