Mo Hua eradicated the zombie disciple, "ate" its evil thoughts, and then began to sit in meditation to refine them.
Within the evil thoughts, there were some mottled memories.
All were about corpse refinement, corpse raising, and corpse control.
The Zhang Family's legacy throughout the generations was all about such sinister activities, ostensibly selling coffins but secretly practicing corpse refinement.
This disciple was the same.
He was also an ancestor of Zhang Quan.
But his talent was mediocre; he was only in the Qi Refinement Realm, and he hadn't been exposed to zombies for long before the corpse poison seized his heart and turned him into a Walking Corpse.
Fearing exposure, the Zhangs killed him and sealed his Divine Thought in the Ancestral Master Picture.
Just like many other ancestors of the Zhang Family.
While it was alive, it became a Zombie, and in death it remained a Zombie; thus, the evil thoughts it manifested posthumously were also those of a Zombie.