The dark cube!

Looking at the great ancestor's frowning face, ye chen said, "Don't be so pessimistic. Let me see how wonderful this stone door is. I'm sure I can solve its secret."

"It seems that's the only way."

The great Grandmaster nodded and then regulated his breathing with ye Wushuang.

Ye chen came to the stone door and observed it closely.

On the stone door, there was a faint ancient aura. It was ancient and powerful. Ye chen could sense that there was a powerful force supporting the stone door.

This power was extremely mysterious, like an unfathomable depth, but also like a vast ocean. As for what it was, ye chen could not be sure for a moment.

He walked to the side and observed. He found that there were hidden lines on the stone door. These lines were very small and ordinary people could not see them. If one did not observe carefully, even ye chen would not have noticed them.

Ye chen released his spiritual energy to investigate the source of the runes.