Lan Wangji is deeply concerned about Wei Wuxian, but despite the bond they share, he's unable to deter him from using dark and dangerous powers. Before the two of them part ways, Wei Wuxian insists he's perfectly in control - a claim that is soon put to the test.

On his way to attend a grand banquet, Wei Wuxian discovers his invitation is a deadly ruse. Jin Zixuan, cousin to the heir of the Jin clan of Lanling, has prepared a huge ambush to claim Wei Wuxian's head. Lives are lost in the tragedy that follows, and though Wei Wuxian escapes alive, things swiftly spiral out of control. Three thousand cultivators swear an oath to slay the Yiling Patriarch, as frenzied corpses bring hell to Nightless City!