Great Yin Yang Nine Transformations Heart Sutra, Yin Yang Harmony, nine transformations uniting as one!
Put simply, this is a dual cultivation manual. Every time you 'Dual cultivate' nine transformations, with one transformation being nine times, that's eighty-one times in total, you can circulate your True Yuan throughout the major and minor meridian circuits in your body once, advancing a minor level.
Martial Dao is roughly divided into seven major levels: Ancient Martial, True Martial, Spirit Martial, Earth Martial, Heavenly Martial, Divine Martial, and Saint Martial. Within each major level, there are nine minor levels.
Wang Hao had just advanced to the True Martial Realm, to be precise, he was at the first layer of True Martial. According to this Yin Yang Harmony manual, to advance to the second layer of True Martial, he just needed to 'dual cultivate' with a girl, eighty-one times.
