When Ye Yinzhu asked how to enhance the strength of the undead he controlled, Phil Jackson told him it was by devouring, devouring other undead.
Feeling Ye Yinzhu's surprise and confusion, Phil Jackson laughed and said, "Are you thinking, boy, is devouring other spirits too malicious? Or are you sensing the evil of necromancers again?"
Ye Yinzhu remained silent, indeed, those were his thoughts.
"If you think like that, you are gravely mistaken. First of all, the cultivation methods of necromancers are different from those of other mages. Yin Zhu, think about it, if humans can be good or evil, can't the undead be the same? When you are cultivating, wouldn't you let the kind-hearted undead devour those evil ones that may cause harm?"