The serpent creatures known as yuan-ti are all that remains of an ancient, decadent human empire. Ages ago their dark gods taught them profane, cannibalistic rituals to mix their flesh with that of snakes, producing a caste-based society of hybrids in which the most snakelike are the leaders and the most humanlike are spies and agents in foreign lands. Ancient order such as the Order of the Flaming Sun were host to many different Yuan-Ti pure-bloods which acted as monster hunters within The Sands of Serrakhan.