Dòng yuán zǐ nèi dān jué 洞元子內丹訣
Master Dòngyuán’s Instructions on Inner Elixir
Anonymous; Northern Sòng
A Northern-Sòng nèi dān instruction-text attributed to the pseudonymous Dòng yuán zǐ 洞元子 (“Master of the Cavern-Origin”). Preserved as DZ 1097 / CT 1097 (Tài xuán bù 太玄部).
Dating. Northern Sòng. Dynasty: 北宋.