 After Yin's death in 688, Louguan remained an important place of Daoist learning, but ceased to be considered part of a distinct school.The most important text from the Northern Wei period of the Northern Celestial Masters is the "Laojun Yinsong Jiejing" (New Code).This text was revealed to Kou Qianzhi in 415, and is now mostly lost apart from a few fragments.