The Sectai Prosperine was originally a gathering of minor sects hailing from the fringes of the Thousand Sons hierarchy. In an effort to increase their knowledge and influence alike, the Sorcerers leading these cults banded together as a single organisation, relegating their personal herladry to symbolic runes and donning the azure, gold and purple of Prospero's ruling caste. In combining their efforts, they surpassed all but the greatest of their rivals in terms of power. They now consider themselves the inheritors of Prospero's true legacy, embracing that planet's dark fate instead of running from it as have many of their kin.