Cult of the Colour out of Space

From publisher blurb: Behold! The Cult of the Colour out of Space! What is the agenda of this alien worshipping cult? Why would any creature follow an entity that seems ambivalent to their existence while simultaneously draining them of their life force? What are the secrets of the Colour out of Space? How do you defeat such a creature? Herein are the secrets of this sinister cult, along with a sample cell of followers, an occultist archetype, and new magic items including the cursed Mysterium Magnus; a rare tome full of foul secrets and vile magic.