Dunjia Tianshu 遁甲天書

In Chapter 49 of the Romance, Zhuge Liang, visiting the ailing Zhou Yu, writes out for him sixteen characters — "To defeat Lord Cao, you must use fire; everything is ready, only the east wind is lacking" — and says that this is the root of his illness. He goes on to say that he once met an extraordinary man and was taught the Heavenly Book of Qimen Dunjia, so that he can summon wind and rain, and that if the Qixing Altar is built on Mount Nanping, he will work his arts on the altar and borrow the southeast wind for three days and three nights. Romance, Ch. 49 §4–7

In Chapter 68, after the incident in which every tangerine Cao Cao cut open was an empty skin, Zuo Ci, appearing before Cao Cao, says that while he was studying the Way for thirty years on Mount Emei in Jialing in Xichuan, a thunderbolt shattered a rock face and he obtained three volumes of a heavenly book called the Dunjia Tianshu. With the first volume, Heavenly Escape, one can ride the clouds, straddle the wind and fly up; with the middle volume, Earthly Escape, one can bore through mountains and pass through stone; and with the last volume, Human Escape, one can hide one's form, change one's body, and send a flying sword to take a man's head. Romance, Ch. 68 §34–36

Zuo Ci tells Cao Cao that if he steps down and follows him to cultivate himself on Mount Emei, he will pass on the three volumes of the heavenly book, and tells him to yield his position to Liu Bei. Cao Cao, calling him Liu Bei's spy, has Zuo Ci seized and tortured, but Zuo Ci snores in his sleep even as he is beaten, and the cangue and chains all fall away. Romance, Ch. 68 §36–38