C323 A Strange Cave

Ling Yunfan and his companions had yet to find what they were searching for. Despite wandering the labyrinth of tunnels for hours, they encountered nothing but the faint traces of auras left by beings who had once trained there—no sign of any creatures or plants.

"Mr. Ling, doesn't something about this Underground Tunnel World seem off to you?" Xuanyuan Lihao paused