Reappear World, Mysterious Clear Palace, Southern Heavenly Pavilion...
On one side of the ancient bookshelf, Song Cheng returned the "Spirit Servant Technique" to the shelf.
In a world where ink flowed like water, there was no light; everything seen was a product of beings like the Master of Mountains and Rivers perceiving the essence of Yin and Yang.
Hearing Lian Chanxi's words, Song Cheng knew that upon entering Entry Level in the "Spirit Servant Technique," he could capture souls and place them into the Yin Residence.
This was why his son and daughter-in-law, although deceased, had been forcibly ensnared by the She Yitu and concealed within the Yin Residence… and even now, they remained passive occupants in his own Yin Residence.
This world seemed to always emphasize "when one attains the Way, even their pets ascend."
Ghosts could produce Ghost Servants.
Children of Noble Families could create Medicinal Humans and give rise to Visualization-practicing Soul Refiners.