Indeed, these are supreme secret techniques that cannot be defeated without battling to the soul's destruction.
Based on Li Fan's current knowledge and conjecture, the ancient martial cultivation route of "The Book of Meridians," "Xian Emperor's Secret Refinement", and "Gang Fist" eventually led to the accomplishment of the esteemed Xian Venerable Path body. Nested within the nine volumes of the Xuanmen's celestial scriptures, it possibly includes the manifest Xuan Female Path Body, the Overlord Body Technique, and the divinity Path Body as mastered in the Blood Sutra Scripture.
The three lineages' ultimate forms of cultivation, reaching the pinnacle, can even shatter the void, ascend immediately, and transfer their physical bodies through realms. These are the ultimate answers of this immortal cultivation world.
