Soon, Kronos/Luke finally comes to Olympus, and Annabeth, Percy, Thalia, and Grover are the only ones there to protect the ancient city. A statue falls over Thalia, and she urges them to go on. Grover gets knocked out almost immediately. Kronos strikes at Percy and paralyzes him. Then Kronos goes for Annabeth and mortally wounds her. Luke regains control of himself, and stabs himself to kill Kronos once and for all. As he lay dying, he asked Annabeth if she ever loved him. She replied that she thought of him like a brother, but never truly loved him at all.
Near the end, as Percy is being offered immortality and life in Olympus, Annabeth feels horrified that Percy would leave her, similar to the way Percy felt when she almost became a Hunter. He turns down the offer, primarily because of Annabeth, and she cries in relief. Back at camp, Annabeth holds a private birthday party for Percy, with a homemade cupcake. Percy confesses his vision in the River Styx. He tries to tell her how he feels about her, but Annabeth simply smiles at him, as if she was trying to hold in her laughter. Percy complains that she is not making things easy for him, to which Annabeth replies by putting her arms around his neck and saying that she would never make things easy for him. She kisses him there and then, while Percy states that he felt like his brain was melting right through his body, and that he could stay like that forever.
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However, the campers, lead by Clarisse La Rue, interrupt and pick them both up, but allow them to be close enough to hold hands. They dump Percy and Annabeth into the lake, expecting them to resurface. But because Percy is a son of Poseidon, he creates an air bubble around the two of them, not unlike the one in the Bay of The Sirens in
The Sea of Monsters, and they share what Percy describes as "the best underwater kiss of all time". They officially start their relationship, and when Annabeth says she wants to be an architect to make something permanent, Percy says that they were "off to a great start."