Wei Wuxian still maintains his guise as the deranged lunatic from the Lanling Jin Clan and resides in the Cloud Recesses. Meanwhile, Lan Wangji, an old cultivation classmate of his, is on a quest for information about the demonic severed arm that is in their custody. The dark aura from the arm poses a dangerous threat and the two must collaborate to prevent it from causing havoc. However, there are other sinister forces in the area, leading to rising spiritual conflicts within the Gusu Lan Clan. Wei Wuxian's downfall further unfolds as his playful character is tested with the demonic arm. He must prove that he has broken free from the forbidden cultivation and is no longer the malevolent mage he was once known as.