Sleeping in Paradise

The cultivation world thought the Yiling Patriarch died from qi deviation years ago. Deep inside Lotus Pier, there is a forbidden area personally created by Yungmeng Jiang's sect leader, Jiang Wanyin and carefully tended by the lady of Lanling Jin, Jiang Yanli. A closely kept secret houses the slumbering form of their adoptive brother.
Then little Jin Ling decided to sneak in to the forbidden paradise.
(prompt: AU where Demonic Cultivation shattered Wei Wuxian's soul before Jin Zixuan and Jiang Yanli's deaths and he went into a death-like state. Since nobody's ever done demonic arts before, nobody's sure if Wei Wuxian is alive or dead so they preserve his body and watch over him.)