Shentu Nantian's first thought was that the "Yin" labeled desolate bone's spiritual backlash had lost its effectiveness. Regardless if it were Shentu Feng or Shentu Hai, handling the spiritual backlash from the desolate bones was a life and death struggle. Only by using powerful sealing techniques could they resolve the danger through great difficulty.
And now, Yi Yun, who was fifteen years old, had used the run-of-the-mill Mystic Crystal Hand. Why didn't he suffer the spiritual backlash without a sound? Also, his speed at extracting the energy was faster than Shentu Feng?
As these thoughts lingered in Shentu Nantian's mind, he watched helplessly as an ashen gray colored gas flowed out of the cracked "Yin" labeled desolate bone in Yi Yun's hands.
This gray gas was cold and silent, it was the spiritual backlash force that was produced as a result of the ancient processing methods used on the "Yin" labeled desolate bone!