The sound of the flute rang out, and immediately a terrifyingly powerful sonic wave transformed into transparent, long swords, surging forward like a torrential river. Wherever it passed, the void trembled, and the aura of slaughter shook the heavens.
**Chapter 560: A Flick of the Finger Astonishes the World**
This was the first time Yun Chen had witnessed sonic waves used as a method of attack.
Chapter 164