Wu Ying took two porcelain long-necked bottles from his storage device. A bright silver thread connected the bottoms of the two bottles.
Both bottles had flared mouths, long necks, rounded bellies, narrowed lower sections, and broad bases, their shapes vaguely resembling phoenix tails.
Delicate lotus patterns were engraved upon the bottles, outlined in multicolored gold that shimmered brilliantly and lent them an air of nobility.
The sole difference between the two bottles was that one of them had four sound holes, like those of a xun instrument.
Wu Ying introduced them, "These are specially made Phoenix Tail Zun from the Bottle Spirit Sect, essential items for performing the Heartbeat Sound Technique."
Under Lu Feng and Ning Xiang's astonished gazes, Wu Ying held the bottle without holes against one of the stone walls beside the entrances to the many branching paths.
As Wu Ying circulated his spiritual energy, the multicolored gilded patterns on the bottle flashed continuously, and several slender spear-like blades with reverse barbs emerged from its flared mouth.
Once embedded in the stone wall, a gentle twist was all it took for the bottle to be secured tightly against it without the slightest gap.
Wu Ying then pulled the connecting thread as he backed away, stopping only when the thread had drawn taut.
Lu Feng watched without blinking. At the instant the thread tightened, he clearly caught a faint stream of light flowing from the shining patterns on the bottle fixed to the wall, along the thread, and into the bottle at the other end.
Wu Ying solemnly told the two of them, "While I'm using the Heartbeat Sound Technique, don't move around carelessly or make too much noise. Otherwise, these ears of mine won't survive."
Ning Xiang hurriedly covered her mouth.
Lu Feng nodded in understanding. At the