If he wanted to condense a Dharma body, he had to use his will as his heart and his divine arts.
Dharma was the foundation of the soul and was between illusion and corporeal.
The Dharma body was the most suitable for all cultivators.
The Dharma realm was to constantly outline the Dharma that belonged to oneself. When the Dharma realm reached the end, one would ascend to the Immortal realm.
Ascend to immortality, and one's lifespan equals that of the heavens!
Of course, it was only a description.
The foundation of a Dharma body was to carry divine arts.
However, it was also difficult to condense divine arts into Dharma.
This was due to certain divine arts conflicting with each other. When these conflicting divine arts were incorporated, it could lead to the entire Dharma collapsing because of their opposing nature. This made it quite challenging for it to progress further.