The beast is revealed to be XuanWu of Slaughter, the very same that Xue ChongHai once controlled. Wei WuXian and Lan WangJi then come up with a plan to kill the beast by using GuSu's String Killing method and having Wei WuXian drive the beast out of its shell from the inside. While Wei WuXian explores the insides of the beast, he finds many corpses that have their soul sucked out, to which Lan WangJi adds that it sounds like the Stygian Tiger Seal's power. Wei WuXian also encounters a sword full of resentful energy and uses it to attack XuanWu. The resentful energy overpowers Wei WuXian and causes him to use dark abilities to attack XuanWu. With both his and Lan WangJi's efforts, the beast is finally killed. In the Nightless City, Wen RuoHan orders Wen Chao to have Wen Xu find the last piece of the Stygian Iron from Xue Yang. Back in XuanWu Cave, Lan WangJi heals Wei WuXian while humming a song that he has named 'WangXian', however, Wei WuXian is unable to hear the name before he passes out. Wei WuXian wakes up to find that both Jin ZiXuan and Jiang Cheng has worked together to save them. Wei WuXian returns to the Lotus Pier with Jiang Cheng and reunites with the family again. However, Jiang FengMian's constant favouring over Wei WuXian causes Yu ZiYuan to be mad. The couple argues again, making Jiang Cheng uncomfortable. After the pair leaves, Wei WuXian chases after Jiang Cheng to assure him that he will be the next sect leader despite what everyone else is saying. (Source: Wikipedia)