No Cultivator was willing to encounter an army of ghouls because the aggressive ghouls were often very disruptive. Even if the Cultivators could eliminate the ghouls by raising their hands easily, their own soul would still suffer minor interference.
If they were surrounded by thousands of aggressive ghouls, the minor interference would accumulate and destroy the steady circulation of spiritual energy in the Cultivator's body. As a result, their soul and body would be corrupted by the devastating auras. Their Cultivation would drop if they were lucky, and they would be mentally deranged if they were not!
One might say that activating the most primitive life potential inside the head with indelible hatred and a miserable death and turning themselves into aggressive ghouls were the only way that ordinary people could check the Cultivators' power in the underdeveloped world of the ancient Cultivators. It was a special 'suicidal attack'!
