Four thin metal patches on which several simple rune arrays were carved were pinned to Ning Wushuang's chest. Their sole use was to receive the signals of Luo Xingzi and the other experts.
According to the deal, the four Nascent Soul Stage Cultivators would send a signal to him every other second. The metal patches would stay quiet when they received the signal.
But if they failed to receive any signal for three seconds, they would shake feebly.
It meant that the telepathic thoughts of four Nascent Soul Stage Cultivators were jammed at the same time.
Normally speaking, it was impossible.
One second passed after another. Although Ning Wushuang controlled his pores by force, cold sweat was still popping up on his forehead.