What is the lower limit of Xu Xian's fairy tales?

Xu Xian is a human being, not a fairy. He and Xu Shilin, the child of the White Snake, are literary stars.

Xu Shilin, the top scholar, went back to his hometown to worship the pagoda and rescued his mother, Bai Niangzi. Both Xu Xian and Bai Niangzi ascended to heaven. The legend of the new White Snake ends here, hehe, wonderful childhood memories ~