From the information currently known, the Golden Willpower, which is the Spirit Elixir, was a residual trace from the Faceless True Immortal's search for the Way.
As the saying goes, born with desires, they pursue the Dao relentlessly until death.
The Golden Willpower that Li Fan absorbed before his Tribulation Body was formed was purely energy and did not contain the conviction of "the desire to pursue the Way."
But now, the Golden Willpower generated by Dao Xuanzi's feedback made Li Fan feel an extremely subtle desire to seek the Dao.
Even though it had been filtered by the stone statue and most of it intercepted, the remaining residue among all the Golden Willpower shone as starkly as the bright moon in the sky, enabling Li Fan to perceive it the moment it formed.
"A sincere seeker of the Way, attains immortality through the Way. It's no wonder he fights to the death with his brothers and chases into the Immortal Realm just for advancement in Techniques," Li Fan mused.