After that, Li Li'an went on rambling about all sorts of basic knowledge concerning ghosts.
The "Resentful Souls" in Tongue-Pulling Hell had generally mastered only one or two ghost arts or yin techniques.
Ghosts that had mastered three or more ghost arts and yin techniques were extremely rare. They were usually not "Resentful Souls," but "Tricky Specters," "Evil Omens," or "Wicked Sins"...
However, aside from "Resentful Souls," these special ghosts—"Tricky Specters," "Evil Omens," and "Wicked Sins"—were basically impossible to capture.
Thus, although Ghost Servants were traded in Gongfeng Square, the price of a high-quality Ghost Servant was worlds apart from that of a low-quality one.
The most important factor in a Ghost Servant's quality was the yin techniques and ghost arts it had mastered.
The next was how thoroughly it had been domesticated...
Normally, when a "Resentful Soul" had just been refined into a Ghost Servant, it was barely domesticated at all. At that point, its master could only use spells to make it carry out very simple commands.
Moreover, the moment its master encountered danger or fell into an extremely weakened state, the Ghost Servant would turn on him without hesitation, devour him, and regain its freedom!
By contrast, a well-domesticated Ghost Servant could understand its master's more complicated commands to some extent.
When its master was in danger, a well-domesticated Ghost Servant was also much safer. It wouldn't immediately turn on him...
As for how to improve a Ghost Servant's domestication, Li Li'an didn't say. Zheng Que didn't know whether he was unwilling to tell him or didn't know himself.
The final factor was a Ghost Servant's adaptability to Yang Energy.
By adaptability, Li Li'an meant that some ghosts had been powerful and exceptionally ferocious before being refined into Ghost Servants, yet afterward, their strength became thoroughly ordinary,