In the early Tang Dynasty, immortals and Buddhas are dead, and demons wreak havoc in the world. With a "Book of Subduing Demons," Li Daoxuan can obtain elixirs and magical powers by slaying demons. Erlang's Heavenly Eye, the Buddha's Golden Body, the Five Thunders of Shenxiao, and the ability to transform into a giant… From the reign of Emperor Taizong to Emperor Xuanzong, he is Emperor Taizong's teacher and friend, the immortal that Empress Wu Zetian desperately seeks, the supremely powerful demon-subduing master personally bestowed by Emperor Xuanzong, and the lover of Yang Guifei… Three hundred years of the Tang Dynasty's splendor, narrating the legendary tale of a generation's celestial master.