The witch Yi carries the bloodline of the witch clan and is the only Primordial Witch left in today's mundane world.
Before the founding Emperor, people's cultivation consisted of four realms, ranked from low to high: refining essence to transform Qi, refining Qi to transform spirit, refining spirit to return to void, and refining void to combine into the Dao.
These four realms were also the primary cultivation paths for ancient Qi refiners.
Following that, calamity prevailed, with demons rising and Dao waning, making the path from these four realms unpopular and replaced gradually by the six Yin realms, creating the current cultivation path of borrowing life to cut life.
However, Witch Yi, with her witch bloodline, was different.
Witch Yi never cultivated the four realms method nor the six Yin realms but focused on the witch clan's ascension methods.