This Chapter details an alchemical process for achieving spiritual transcendence. It describes the cyclical interplay of Yin and Yang, both cosmically and within the human body, using analogies to explain how to cultivate internal energy. The goal is to unite opposing forces ("True Dragon" and "True Tiger") within the practitioner, resulting in the creation of a "True Embryo" and ultimately, immortality. Specific instructions and visualizations are provided to guide this internal alchemical transformation.