Jason, now using a cane and bearing a scar on his face that Kierse gave him, confirms that he’s also Cillian. He tells Kierse that he survived her attack, which paralyzed him. Learning to walk again required years of physical therapy, magic, and rehabilitation. He reveals that the trap wasn’t set for her specifically but for whichever thief thought they could best him. When Kierse confronts him about her erased memories, Jason claims that he was “saving” magical children by bringing them into his thieving guild. Kierse realizes the truth: The spell was never a block for her protection but a siphon to steal her magic. Jason admits that he used her and the other children as a power source and that her unique absorption ability was very useful. He also claims to know the identity of the Fae Killer. Enraged, Kierse headbutts Jason, breaking his nose. In the ensuing chaos, she pushes her powers to their limit and phases through time to escape the iron bonds.

Shocked by her escape, Jason uses information about the Fae Killer as leverage to discourage Kierse from killing him and then flees the room. His followers attack, and Kierse directs blasts of power at the guards but gets shot in the shoulder. Weakened by the wound and magic drain, she pursues Jason to the hotel loading dock, but he escapes in a van. As she collapses, another van arrives carrying Lorcan, who says he heard her call. He lifts her inside, where Niamh begins healing her. Kierse demands to be taken to Graves, but Lorcan refuses. At his signal, Niamh uses magic to put Kierse to sleep.

Kierse awakens in the Oak Throne room to find Lorcan seated on the throne. Her wound is healed, but her magic is depleted. Lorcan insists that she isn’t a hostage but refuses to let her return to Graves. He argues that Graves has been manipulating her mind, citing concerns relayed through Niamh from Gen and Ethan’s direct report to him as evidence. He claims that Kierse’s rejection of their soulmate bond is a result of Graves’s influence, just as Graves had mentally destroyed Emilie before her death. Kierse defends Graves, but Lorcan is resolute and insists that he must protect her. When she tries to leave, he stops her and declares that they will be formally bound through a magical ceremony that night.

Lorcan magically restrains Kierse as Niamh and other Druids enter to begin a handfasting ceremony, which will finalize the soulmate bond between Kierse and Lorcan. Kierse pleads with a conflicted Niamh, who proceeds because she believes that Graves is a threat. As Niamh binds their wrists with a golden cord, powerful magic fills the room, attempting to lull Kierse into submission. She resists, screaming that Lorcan is violating her autonomy. Lorcan retorts that he’s saving her life from Graves, who he claims was destroying her mind. Desperate, Kierse tries to mentally call for Graves, but she gets no response. As the ceremony nears completion, Niamh sees Kierse’s despair and tries to stop, but Lorcan forces her to continue. Horrified, Niamh challenges Lorcan for leadership of the Druids. Just as the binding is about to become final, the doors burst open, and Graves appears, wielding the Spear of Lugh.

Graves enters the throne room, accompanied by Ethan and Gen. Ethan summons vines from the ground to restrain the Druids, while Gen, her powers now amplified, incapacitates those who break free. Graves kills Lorcan’s second, Declan, and then uses the spear to sever the cord binding Kierse and Lorcan. However, Lorcan reveals that the ceremony was completed and that he now has control over Kierse’s magic. Kierse discovers that her wisp powers are gone and feels that the bond is now a permanent, open link. When Graves moves to kill him, Lorcan warns that their magic is now entangled; if Lorcan dies, Kierse will die, too. Instead of killing him, Graves unleashes the full power he possesses as the Holly King, draining Lorcan and reasserting his own seasonal dominance. As Graves falls to one knee from the effort, Niamh takes her seat on the Oak Throne, claiming leadership.

Niamh, now head of the Druidic Order, exiles Lorcan and allows Graves’s party to leave. In the limo, Ethan explains that he went to Graves for help after realizing Lorcan’s plan, and Graves confirms that he heard Kierse’s mental call. Gen explains that the cauldron had been opened by Graves, Walter, and Laz to save her life and that this amplified her powers for the throne-room fight. Kierse feels that the magical bond to Lorcan is still intensely strong despite the distance, and she becomes distraught.

Back at the brownstone, the connection to Lorcan is a constant, nauseating presence. Kierse tells Graves that the Curator is Jason, that the memory spell’s purpose was to let him siphon power from her, and that Jason knows the Fae Killer’s identity. Graves suspects Jason’s other victims could be undiscovered wisps. Kierse asks Graves to use his powers to break the binding, but he can’t bypass her absorption. Graves confesses that he has unsuccessfully tried in the past to make his magic appear as hers so that he could access her mind more easily. He admits that while he was later tempted to magically influence her loyalty, he chose instead to earn her trust honestly and denies ever manipulating her feelings. He then promises that they will find a way to break the binding, suggesting that they use the cauldron.

The next morning, Nate arrives and is enraged to learn what Lorcan did. The group gathers to use the Cauldron of Dagda. Nate goes first and receives a potion to break Maura’s incubus curse, allowing them to have children. He leaves, overjoyed. Kierse then holds the iron cauldron, which doesn’t harm her. A voice from the cauldron explains that it can’t break the soulmate binding, as the ritual was done correctly. It offers another way. When Kierse affirms that she wants to remain part human, she’s wracked with a painful energy that deconstructs and rebuilds her. Afterward, the bond to Lorcan remains, but her magic is restored. Her old wisp powers are still blocked, but Graves theorizes that the cauldron gave her the other half of her Fae heritage. Lorcan can’t control these new powers.

In the week before Nate and Maura’s wedding, Kierse tries to understand her new, unknown powers. She learns that Graves also used the cauldron, asking for his Druidic magic back. He explains that he traded it away 70 years ago for information. The cauldron refused to restore it, saying that the loss was his own fault. At the wedding, as Nate and Maura are bound together with a traditional necklace, Kierse is painfully reminded of her own forced binding. The celebration is cut short when trolls storm the rooftop just after Nate and Maura are pronounced married.

Trolls surround the wedding guests, led by Nova Lee, Nate’s rival from the Men of Valor. A troll grabs Maura, and a battle begins. Graves creates a magical dome to shield the humans while Gen and Ethan attack the troll holding Maura. Kierse shoots and kills the troll, freeing Maura. As Nate rushes to his wife, Nova attacks him in her wolf form and rips out his throat. Nate dies in Maura’s arms as she sobs that he has to be there for their baby. Gen confirms that the wound is too severe to heal. Nova declares the attack a warning to anyone who opposes the Men of Valor and retreats with her forces, leaving Kierse to realize that a new monster war is about to begin.

In exile at a safehouse in Midtown, Lorcan plans his next move with a small group of loyal Druids. He reflects on his past with Graves, whom he once considered a brother. He recalls how Emilie grew fearful and confused in the weeks before her binding ceremony to Tadgh, leading him to realize too late that Graves was responsible for destroying her mind. Now, determined to prevent Graves from hurting Kierse, Lorcan decides that he must get ahead of his enemy. With Graves holding the spear and cauldron, and Lorcan’s own sword locked away, only one of the four objects remains. He contacts his ally Oisín in Dublin and declares that it’s time to seek the last of the Four Treasures, the stone.