The Unnamed Darkness

In a distant land polluted by an alien menace from beyond the stars, a great cancer grows within the earth. As its tendrils reach out through the dreams of those who learn and study its existence, a sinister cult grows more active in preparing the way for a devastation that will destroy more than the minds of would-be heroes. Can the adventures reclaim lost memories in time to stop the advance of a cataclysmic contagion that could threaten all of Golarion? Can they resist the mind-shattering truths revealed by the Yellow Sign, and the monstrous force it symbolizes?