At the spot where the white bead had just been taken away, there was now a hole only as thick as a thumb in the smooth cave wall.
Had Qin Fengming not been paying special attention to that spot, with his Pure Spirit Divine Eye still active, he would never have noticed, amid the rapidly flowing lake water, that such a slender hole existed in the stone wall of this pitch-black passage.
As his divine sense swept over it rapidly, Qin Fengming's expression changed again.
That was because the tiny hole was actually filled with the same terrifying aura contained in the milky-white bead from before.
"Could there be some hidden secret inside this hole?" Seeing that there was a hole behind the bead, Qin Fengming's thoughts raced.
The hole was too small, and the stone wall was far too hard. Qin Fengming's divine sense could not probe very far inside.
Without hesitation, Qin Fengming raised his hand, and a short crimson broken sword appeared in his palm.
A flash of red light streaked by, and the broken sword stabbed directly into the stone wall around the hole.
"Clang!" A clear metallic ring sounded through the rapidly flowing water. A mark no larger than a grain of rice appeared on the stone wall.
A very faint fluctuation suddenly emerged from the stone wall. It spread rapidly, then vanished without a trace.
"There's a restriction on this cave wall. No wonder even magic treasures could barely damage it." Seeing the rapidly emerging fluctuation disperse, Qin Fengming was startled.
Qin Fengming had never expected there to be a restriction on this smooth cave wall.
Even when examined from close up, it was difficult for even his Pure Spirit Divine Eye to detect any fluctuations from the restriction.
"Could this place have been