What was Dao?
Heaven and Earth's Origin Source, the true essence of the world.
According to legends, gods grasped the Dao of Heaven and Earth and were invincible in the world, transcending life and death.
Martial arts, alchemy, and formations were three different angles of pursuing the Origin Source, searching for Dao. However, just as Small Tower said, Dao begets One, One begets Two, Two begets Three, and Three begets all things. Mortals were commonplace, even Ling Han who was a Heaven Tier in his former life remained at the level of all living things, striving to trace the Source Origin and searching for the "Three."
He was still very far off in martial arts, but in alchemy, he reached the peak stage of Heaven Grade, with one foot into the path of godhood, qualifying to contact the "Three."
But now, a small piece of black stone actually contained the Chaos Origin Source, reaching the "Two" level.