C2137 The Danger in the Cave.

"A thousand years! I accidentally entered this place and obtained the core of the formation. It took me a thousand years!"

Nanji Gong sighed with emotion, "If it wasn't for a black bull forcefully breaking through the barrier between the heavens and the earth, I wouldn't be in such a hurry."

A black bull?

Ye Feng's heart skipped a beat when he heard that.

He thought of the Ox Demon King