Why does God wear a black robe?

God wears a black robe because he belongs to the inferno.

The God of Tian Xuan, the Emperor Zhenwu, or Zhenwu, the real king of the North Pole. Zhenwu is Xuanwu, the god of the north. In the Song Dynasty, he avoided its mystery and turned it into truth. His name is Zhenwu, the northern god of Taoism in the Song Dynasty and the protector of the Ming emperor. At the beginning of the Yuan Dynasty, the Buddha said that Yu Yuqing, when he saw the evil wind, ordered to cut down trees to cure Yang and ordered to cure Yin. Therefore, Tian Xuan God is also the Lord of the Sword Fairy who presided over military affairs, ranking second only to Guangcheng Sword Fairy, the ancestor of the Sword Fairy.

Zhenwu flourished in the Song Dynasty, and in the Yuan Dynasty, it was promoted to be a god. In the Ming Dynasty, Zhenwu became the ancestor, and its status was even more prominent. In the legend of Zhenwu, it is also said that the tortoise and snake were formed by the separation of two gases by the six heavenly demons, but they were prostrated at their feet by Zhenwu's divine power and became their department. Later people called it the second general of tortoise and snake. Tian Xuan gods often cut off demons and travel with imperial swords. Wudang Mountain is a sacred place for mysterious gods.