Seeing this, Cheng Zongyang hesitated no longer. He slightly adjusted his posture, struggling to open his mouth into a narrow slit within the confined space.
The next moment, a subtle yet highly penetrating Dao of Sound Wave emitted from his mouth. The sound wasn't loud at first, but like a stone skipping across a tranquil pond, it rapidly formed a rhythmic vibration within the ice. It rippled outward in successive waves.
Under the impact of this Sound Wave, hairline fractures began to appear in the ice. Initially, they were just fine, spiderweb-like cracks, but as the continuous vibrations took effect, they gradually widened and deepened. Cheng Zongyang increased the output of the Sound Wave, his eyes locked on the changing ice.
