Hastur - The King in Yellow

Hastur, the King in Yellow appears as a figure dressed in tattered yellow robes, sometimes with a vague halo around his head, sometimes with a red crown or a pair of wings. Nobody knows who or what the King in Yellow truly is, and neither is it clear whether or not he is truly hostile towards sentient beings. The madness caused by the King's presence is even considered to be enlightening by some.
Hastur is worshipped by decadent and hedonistic nobles, aristocrats and artists who have grown bored with life and have sought out increasingly deviant, bizarre, and self-destructive methods of achieving gratification in life. His temples are opulent and excessive—opera houses, manors, and the like that contain hidden chambers for pastimes best indulged in secret. His cultists are particularly eager to bring innocent humans and other humanoids into their fold, exposing them to the Yellow Sign so that their bodies and minds can serve as portals through which the King in Yellow may walk the world.
Symbol
The Yellow Sign
Home Plane
The Far Plane
Alignment
Lawful Evil
Domains
Creativity
Art
Madness and Domination
Divine Classification
Outer God