Qing Songzi nodded, immediately followed up and said, "Such black mines are filled with evil aura, imbued with a powerful curse. Ordinary Yin Spirits would quickly be infected by the evil power and turn into Evil Ghosts as soon as they enter."
"Therefore, only Evil Ghosts can mine the spiritual metals in the mine. Ordinary Yin Spirits can't."
Xiao Mu curiously asked, "In that case, why not directly use Evil Ghosts for mining?"
Qing Songzi shook his head with a bitter smile, "It's not that simple. Evil Ghosts are our mortal enemies. At the moment, we do not have the power to control them."
"Even if an Evil Ghost is captured, it would struggle relentlessly and never give in."
"Oh!"
Xiao Mu responded, but he didn't comment any further.
He felt something was off with Qing Songzi's words. He himself had encountered Evil Ghosts that would give in, they would even beg for mercy and proactively serve him for the sake of survival.