Who are they?Edit
'Deathless' sorcerers from the East. Modern day representative of the Tsan Chan, an empire from far in the future (around AD 5000), which works dark magics to alter the past. Some sources refer to the Kuen-Yuin as one collective clan of sorcerers, who worship a pantheon of gods, favouring Cthulhu and The Bloated Woman, though also worshipping Yig, Yog-Sothoth and Hastur. Others suggest that the Kuen-Yuin are just one clan that dwell in the dream city of Yian and are are more concerned with the latter two gods, and that the former two gods are followed by allied earth-bound clans who will eventually form the Tsan Chan with the Kuen-Yuin.
The various clans are also claimed to be connected to (or sometimes ruled by) the yellow-masked High Priest Not to Be Named, and his great monastery in Leng, though frequently it is suggested that it is the faction most concerned with Cthulhu that has closest ties.
Of similar interest are the Natives of K'n-Yan, immortal psychics who follow a pantheon which also includes Hastur and Cthulhu. That this is not too different from the immortal sorcerers of the East suggests a connection (other than different authors inspiring each other). Perhaps the Kuen-Yuin are also descended from an extraterrestrial background. And perhaps, in times long past, Cthulhu and Hastur were worshipped side-by-side, and not recognised as enemies as seems to be the case now. It's also interesting to note the similarity in names between the dream city of Yian and K'n-Yan, as well as the latter's central city of Tsath (named after the god Tsathoggua and the future Tsan Chan. These, of course, may be purely coincidental.
What are their methods?Edit
Independent of which gods they worship, they appear to use dark magic and torture behind the scenes, not to mention beyond the veils of time and sleep. That said, their operations seem to be concentrated within their native regions, though with international travel commonplace, this needn't be a limitation.
What are their beliefs?Edit
Whether they chiefly worship Cthulhu and The Bloated Woman, or whether they concentrate their worship on Hastur and Yog-Sothoth, their beliefs seem to concentrate on bringing about the great Tsan Chan, and of encouraging its future powerbase on the earth. In any case, they accept the idea of a pantheon of gods, recognising and using many strands of The Cthulhu Mythos to reach their ends.