C707 A Thought of Life and Death

Not far away in a very inconspicuous corner, there was an oval-shaped stone embedded in the stone wall. The stone was not big, only the size of a palm, and its tip was abnormally sharp. Like a sharp sword, the light shone on it, emitting a cold light. The color of the stone was also grayish-black, and it was exactly the same as the surrounding stone walls. If one didn't look carefully