"Sect Master Han. Have you ever tried extracting energy from a Demon Core?"
Since Xiao Wugou was already in a semi-demonic state, he could not personally experience Han Feng's predicament, so he offered advice: "You should know that as long as the violence and malevolence inside a Demon Core are wiped away, it can be used just like a spirit stone to replenish spiritual essence."
"I've tried. It doesn't work." Han Feng shook his head and gave a slight, wry smile. "Since a Divine King made a move, it's impossible to leave such a massive loophole. The method of sustaining the fight by fighting still doesn't work."
Chapter 176