There are many sects in Jiuzhou in the Central Plains. Although the immortals are respected, their roots are hard to find.
After the Yellow Emperor, Yan Emperor, Chi You, and Zhuolu, although the Yellow Emperor unified the Central Plains, descendants continued to pursue the three sects of cultivating immortals, and each person had their own differences.
The Yellow Emperor's method is intricate and complex. Countless sects have established themselves after obtaining one of the methods. The famous sects all regard the Yellow Emperor's method as the foundation of their sects. The people of the Demon Sect all regard Chi You's method as the foundation. Only the Yan Emperor's method has very few people who practice immortality. But the real big sects all know that the Yan Emperor's method is supreme, but they don't know how to obtain it.
At that time, Emperor Yan was kind to the people and did not want to fight with the Yellow Emperor. He gave up the country and lived in seclusion until he passed away. He transformed his body into a piece of red dragon jade, which was called "Yanlong Jade" by later generations. Later generations have been searching for the cave where he was seated, but to no avail.