The giant hurls Kiel and his dragon at Bethany. Kiel magically gives the dragon six wings, letting it fly beyond the giant’s reach. Enraged, the giant leaps into the air, and Bethany realizes that when it lands, it will obliterate the town. She drops her book and sprints beneath the falling creature, opening Twenty Thousand Leagues Under the Sea and stepping onto a page. When the giant crashes down onto her hand, both are pulled into the book’s ocean. Bethany immediately jumps back to the real world, soaked but unharmed.

She celebrates until Kiel turns her around. The Magister stands before them, backed by a vast army of fictional creatures—griffins, dragons, trolls, witches, and more. He greets Kiel, assuming that the boy has returned to his cause; Kiel, however, insists that the Magister undo all his damage. The Magister refuses, declaring his intent to free all fictional beings and imprison every writer inside fictional worlds as punishment for controlling fictional lives. He demands that Bethany hand over Jonathan Porterhouse, the first writer he intends to imprison. When she vows to undo his every action, the Magister knocks her unconscious with a gesture.

Charm reminds Owen that Dr. Verity will destroy Magisteria in under 10 hours. Owen coaxes his spell book into cooperating, and it opens to a hidden section of black pages printed in blood-red writing. A warning declares that the spells within will destroy any caster who lacks sufficient power. Owen locates a spell called Conquer Death, written in a dark, unfamiliar language.

As he speaks the words, the cave temperature drops sharply, and his light spell flickers. He closes his eyes and finishes the incantation, and the light dies entirely. Two green lights ignite in the skeleton’s eye sockets, and a green radiance forms decaying flesh around the bones, raising the First Magician as a zombie. The creature ignores Owen and fires a burst of green energy across the cave. All the destroyed Science Soldiers begin to reanimate with glowing green eyes and shuffle toward Owen and Charm.

After being knocked unconscious, Bethany finds herself in a dreamlike vision of her fourth birthday party, moving through it unseen. A deep male voice tells her that a critical mistake is about to unfold. When she tries to intervene in what’s about to happen, an invisible force holds her in place. Young Bethany receives a book as a gift, and she, her father, and the other children vanish into it. Her mother finds the living room empty except for the open book and desperately pleads for her daughter to return.

The voice reveals itself as the Magister, framing the experience as a lesson about how it feels to be powerless. The vision then shifts: The children climb back out of the book, followed by young Bethany. Her mother demands to know where her father is. Young Bethany reaches into the book and pulls him out by the hand. As the family reunites, the Magister suggests that stories might yet change once writers no longer control them.

Charm shoves Owen clear of a magical blast, hands him a ray gun, and orders him to stop using magic. When a shot from the zombie strikes Charm’s robotic arm and causes it to turn against her, she shoots her own arm off at the elbow and destroys the detached, crawling limb. Charm stops Owen from killing the zombie magician, insisting that they need information from him. She recognizes the cave as a magic-based version of the science trap from the Original Computer and theorizes that science may be the counter. When a magical blast possesses Owen’s spell book, he shoots it to pieces.

Charm uses a defibrillator from her first-aid kit to charge the zombie magician and send a powerful electric shock through it. It collapses and then coughs and sits up, restored to lucidity. The First Magician dismisses the reanimated robots with a wave and restores his appearance to that of an elderly scientist in a white coat. He explains that he was once a scientist on Quanterium who helped invent magic before a group departed to found Magisteria. Now fading again, he reveals that the Seventh Key was destroyed after the vault was sealed but can be re-created from the physical heart of a truly selfless individual, although removing it kills the person.

Bethany finds herself in another story, in which her father presents her with a man-eating Pegasus as a birthday gift. She tames the creature and rides it toward Mount Olympus. A man’s voice breaks through, identifying himself as “[n]obody important.” He tells her that the Magister wrote her into this fictional life to keep her from interfering with his plans. Bethany refuses to leave, insisting that this is the life she deserved.

The voice warns that the Magister will imprison everyone in her world inside fictional stories if she doesn’t return and that both Kiel and Owen are in danger. The mention of Owen cuts through her resistance. She asks to say goodbye to this version of her father before leaving, but the Pegasus bites her hand and throws her from its back.

Owen sits alone in the burned-out ruins of the Magister’s study. Charm teleports in with Kiel’s winged cat, Alphonse, who conjures food for himself. Owen tells Charm that he can’t sacrifice himself. He fears that he has endangered Bethany. Charm says that she would give her own heart if it weren’t mechanical. Owen recognizes that staying in the book was selfish and that he has made this fight his own.

Charm gives Owen the magic box that Kiel once gave her and leaves for her ship to seek another way to stop Dr. Verity. When Owen asks why she has become more openly emotional, she credits him and teleports away. Alphonse settles on Owen’s shoulders and purrs. Owen opens the box and finds a teleportation button that will take him to Charm’s ship. As he presses it and vanishes, he notices a robotic heart lying at the bottom of the box.

Bethany lands in a dark dungeon. Kiel’s voice comes from a nearby cell. He confirms that the voice she heard inside the story wasn’t his and then reveals that the Magister used a forgetting spell to strip him of all magic. Bethany despairs until Kiel points to a skill that predates his training: As a former street thief, he knows how to pick locks. He frees himself and then Bethany, explaining that he didn’t escape earlier because he refused to leave her behind.

Kiel urges Bethany to stop reacting to events like a person from the real world and instead act more fictional to embrace the impossible and get ahead of the chaos. While Bethany sarcastically proposes absurd ideas aloud, she develops a genuine plan. She will find the books that the Magister stole from Jonathan Porterhouse’s library. She sends Kiel—unarmed and without magic—to round up all the fictional monsters outside and drive them back into the tower. Kiel agrees enthusiastically.

Aboard her ship heading to Quanterium, Charm maps out the obstacles ahead: breaching the planet’s teleportation-blocking shields, crossing territory held by multidimensional Science Soldier armies, and moving without disguise since Owen’s spell book is gone. Owen tells her that if he doesn’t survive, she should take what she needs and finish the mission; she refuses, promising to get him to the vault. She tells him that his willingness to sacrifice himself means he has already won.

Owen considers revealing his true identity to Charm but decides that the confession would destroy her trust, so he simply tells her that he’s glad to have known her and hugs her. The moment is interrupted when Quanterium missiles strike the ship and send it plunging out of control. A hologram of Dr. Verity materializes on the bridge and explains that he considered allowing them to reach the vault for a more dramatic ending but decided that immediate elimination was safer. He informs them that the hologram will convert to solid matter and explode when he finishes speaking. He thanks them for serving as his scapegoats—their actions have made it easier for him to start a war against Magisteria—and the hologram detonates.