The Sound Retaining Stone could be considered a useful tool in the past.
However, since human society began to develop science, products like recorders, MP3s, MP4s, and cellphones emerged, overshadowing the utility of the Sound Retaining Stone.
But Su Nanzhi had a master of an unknown age, who collected piles of items, and this Sound Retaining Stone was still a toy from Su Nanzhi's childhood.
It just so happened that she had used it just now.
After the Sound Retaining Stone was activated and thrown in, that mass of black fog became even more violent.
Su Nanzhi took the opportunity to strengthen the Binding Spirit Array, then stuffed a Life-saving Medicine into Jiang Beiyu.
Her own condition wasn't great either, as close combat had indeed imposed a heavy physical burden on her.
Su Nanzhi was also pale, but she stood before the Binding Spirit Array and said to the mass of black fog, "Does this poison of yours have an antidote?"
