According to Bai Ye's understanding, their Sky Mansion's North Gate's Shentu sect master was originally the one with the highest cultivation level among the elders in charge of the sky Mansion. He was also the junior Brother of that generation's Sky Mansion sect master. He could be said to be a legendary figure of his generation.
During the Shentu sect leader's reign, the north gate of the sky Mansion had always been the strongest of the four main branches of the sky Mansion. The other branches simply could not compare to the north gate.
However, with the death of the Shentu sect leader, the north gate of the sky Mansion declined. Furthermore, it became worse and worse with each generation, until it was almost squeezed out of the sky Mansion.