This unique presentation by a fully trained and deeply immersed Western Daoist outlines the transformation of the monastic Quanzhen order after the Cultural Revolution, focusing on the Thunder Drum (Leigutai) lineage in Ziyang county, Shaanxi. It documents the massive expansion of Daoism after 1979, carried by the government, the Chinese Daoist Association, and many local priests who reoriented their practice from personal cultivation to temple building and the spread of longevity techniques while also opening their teachings to foreigners. This changed again in 2018, with the policy of “sinification,” which now requires all religions to represent Xi Jinping Thought and severely limits their activities. The book analyses the modifications at the organizational and doctrinal level that continuously require Daoists to adapt to ever-new political and social contexts. It is a pioneering work, essential for our understanding of religion and culture in China today.