Everything in the world has "qi", people have "qi", ghosts have "yin qi", gods have "spiritual qi", and spirits have "spiritual qi". Practitioners improve their cultivation by absorbing the "righteousness" between heaven and earth, and the "Youyang Posthumous Chapter", a fragment of "Youyang Zazu", is the core key - this book was written by Duan Chengshi's grandfather. It records the secret techniques of connecting the three realms and driving ghosts and gods. Each chapter corresponds to a "rule of heaven and earth", such as the "Ghost Summoning Chapter" can summon stagnant souls, the "Suppressing Evil Chapter" can drive away evil ghosts, and the "Tongshen Chapter" can worship the righteous gods.
However, "Youyang Posthumous Chapter" has the "risk of backlash". The user needs to use his own "Qi" as a guide. If the mind is not right, it is easy to be backlashed by Yin Qi and become a "half-man, half-ghost" monster. In addition, the "national destiny" of the Tang Dynasty will affect the direction of spiritual energy. On the eve of the An-Shi Rebellion, Chang'an's spiritual energy was disordered and evil spirits breed. It was precisely due to the "decline of national destiny".
