that's enough to kill tens of thousands of bison. Yang Tian used it to exercise his body meridians. There was a strange green light on his body, which was as deep and full of vitality as the ten thousand year old giant wood. Then, the green light gradually turned to the gray color without any vitality, as if it had become a stone. The color of the light gradually deepens, gradually turns to cyan yellow with a light golden luster around you, and finally turns to a very deep gray brown with a silky light inside. It's like the mountain rock on the top of Kunlun mountain which has been...