What does the tortoise and snake in Taoism represent?

Xuanwu, the northern god, is the northern ghost water god. It is said to be a leading turtle, one of the four spirits of China. Zhenwu Emperor is a legendary immortal who practiced in Wudang Mountain again. He also said that Zhenwu Emperor was Xuanwu. In order to consolidate his imperial power, Ming Chengzu represented himself with theocracy. Ming Chengzu let people say that he is the embodiment of Zhenwu Emperor, who was originally the God King of the North. He came to Wudang Mountain to dominate the immortals in the world. The implication is that Judy, his Ming emperor, abolished Nanjing Jianwen Emperor from Yanjing in the north and became the highest ruler in the world, so in any case, all this is political. It is not uncommon for China to be banned for political reasons since ancient times.