Even if he is already old and gray, the Emperor is still the master of the Ji Family who cultivates the "Form Tomb". This dharma body, created by successive emperors combining their Dao Fruits, is like the embodiment of the Nine Provinces, incorporating the world into one entity.
The "Form Tomb" is a method of the law cultivation body. At the Emperor's strongest, this body carried the power of the Nine Provinces, making it the premier dharma body in the world, one that even the perfected "Buddha's Scripture of the Strongman Moving Mountains" of the Buddha Country cannot match.
Even now, the strongest aspect of the Emperor is still his physical body.
