This divination indicates that the dragon is Yang and this divination is Yin, so the dragon war refers to the battle of Yin and Yang. Outside the city is the suburbs, and outside the suburbs is the wild. Huang Xuan refers to the colors of heaven and earth respectively. Heaven and earth are the largest yin and yang, and its blood is Huang Xuan, which means the blood flowing from the dispute between yin and yang, indicating that this divination is fierce. ..
The juice of the dragon's blood tree is black and red, so dragon's blood may also be black and red.