DEITY
Known as Him Who Is Not To Be Named, the Unspeakable, or the King in Yellow. A Chaotic Evil Great Old One of the Elder Mythos, dedicated to Decadence, Disorder, and Nihilism.
Referenced by Avros Setrakian in Ulver Zandalus' ecclesiastical record.
In Chapter 21, Gull had faint memories of him, thinking of him as an imprisoned being, perhaps trapped somewhere but still able to reach out and touch the world. He knew that cults dedicated to the King in Yellow exist in Golarion, and Dora thought of them as somehow being associated with decadent acts of bloodletting happening during public events of high culture (plays, operas, or the like).
In Chapter 29, Dora recalled that the Tatterman was one of his notable servants.
In Chapter 39, the party began to understand that the star stelae and the nightmare city were tied to Hastur somehow.
In Chapter 40, the party recalled that narcotics are consistently involved in the worship experience of Hastur’s followers.
In Chapter 43, the party recalled definitively that Carcosa is where he either lives or rules or is imprisoned, and that he has some link or tie to Xhamen-Dor.
In Chapter 50 (Part 1), the party saw his unholy symbol (the “Yellow Sign”) for the first time: a blackened silver oval with a yellow triskelion symbol embossed upon it; a small sphere at the center with three oddly-shaped barbed arms radiating out from it.
In Chapter 74, the party learned that his Clerics’ domains are Chaos, Evil, Rune, and Void. Subdomains: Dark Tapestry, Language, Stars, and Wards. Favored weapon is the rapier. The third level domain spell for the Void domain is fly. Second level is levitate,and the first is feather fall.
In the Act III Prologue, the party experienced a series of visions from Xhamen-Dor's impossibly long lifespan, which included flashes of events involving Hastur billions of years ago.
In Chapter 123, the party learned some details from Captain Vadrack's journal about what Vadrack found when he recovered Weiralai from the slave pits of the Moon-beasts in Leng. She had been, in her words, “embraced by the King,” who had “hollowed her heart and warped her flesh,” and she had new, apparently divine, powers granted to her by Hastur.
First Reference: Chapter 18
Other Notable References: Chapter 21, Chapter 29, Chapter 39, Chapter 40, Chapter 43, Chapter 50 (Part 1), Chapter 62, Chapter 74, Act III Prologue, Chapter 123, Chapter 125, Act III Interlude 2, Chapter 150 (Part 3), Chapter 183