C535 Underground Volcano

"Do you recognize this thing?" Feng Qingtian asked curiously.

Gu Zhuohua shook her head. "How could I? This is the energy source that powers the puppet's movements. It's hard to imagine how long that cave has existed, and yet this tiny stone has managed to sustain it all this time. I have no idea what it could be."

"Besides a Nuwa Stone