Founder of Diabolism/Grandmaster of Demonic Cultivation
-Wei Wuxian incarnated inside the body of Mo Xuanyu to avenge him of whatever-it-is he wants to be avenged for (that he didn't mention during the sacrificial ritual). Having no clue for what his reason for being incarnated is, he set off to wreak havoc on Xuanyu's family and unexpectedly met disciples from a sect he was acquainted with in the past.
Mo Dao Zu Shi