Once he had cultivated a Primordial Spirit, he could separate a part of it to be placed into the Yun Soul Bamboo. With the bamboo as its core and using a fresh corpse as a vessel, he would be able to refine a Life-bound Avatar that belonged solely to himself.
This avatar could communicate with the original's thoughts and would completely obey the original's command, as if he had gained another self. It had great uses.
The most critical aspect was that even if the original's body perished and his path ended, as long as the avatar remained, his death would not be considered absolute. Over time, the Primordial Spirit of the avatar could be nourished and strengthened by the Yun Soul Bamboo, and it might even fully recover the original Primordial Spirit. In this sense, it could almost be considered a rebirth.
After all, except for the flesh that was not originally his, the soul would be fully recovered. In a sense, this method was equivalent to seizing a body or borrowing a corpse.