Mgos Zhang Rabten is a Tibetan lama Rinpoche and a priest of Kuen-Yuin. "Rabten" means "Unwavering faith", and he does justice to his name, with his loyalty to the Great Old Ones. Rabten, like other cultists of Kuen-Yuin, has been infected by Nyarlathotep's poison, which horribly disfigured him, but marks his position and his faith. Rabten lured Emil Kurjak into a trap, and implanted the Pale Mask in him, an avatar of Nyarlathotep, and the tool to reopen the passage to the multiverse to the Great Old Ones.