<P> Meanwhile, Reyna Avila Ramírez - Arellano, Nico di Angelo, and Coach Hedge head back to Camp Half - Blood with the Athena Parthenos using shadow - travel . After reaching Pompeii, Reyna learns from her dreams that they are being hunted by a giant . At Évora, they are attacked by Lycaon and his aides . They defeat him and shadow - travel to San Juan, Reyna's homeland . Reyna is captured by the Hunters of Artemis, led by Thalia Grace, who are working together with the Amazons, led by Reyna's sister, Hylla . The giant, revealed to be Orion, appears and massacres both the Hunters and the Amazons, but before he could reach Reyna, she, Nico, and Hedge shadow - travel to South Carolina . Reyna reveals her life before Nico and Hedge while secretly being spied upon by Bryce Lawrence, a ruthless legacy who was once exiled from New Rome by Reyna before being reinstated by Octavian . He tries to execute Reyna for patricide when she reveals her "killing" her father's insane spirit, but is turned into a ghost by a furious Nico . </P> <P> Arriving at Camp Half - Blood with the help of Pegasus and several of his brethren, Nico and Hedge head out to the camp while Reyna lands on the yacht Mi Amor in Long Island Sound . She is confronted by Orion and manages to kill him with the help of her mother, Bellona, and Athena . Nico meets up with several Greek demigods, including Will Solace, to hijack Camp Jupiter's onagers . Just when the two camps are about to clash, Reyna reveals the Athena Parthenos, ending the warfare before it even starts . However, Gaea suddenly rises and begins to attack the camp . The seven demigods, transported by Zeus, arrive and battle Gaea . Piper uses her charmspeak to make Gaea sleep, then Leo sacrifices himself with the help of a newly revived Festus while blasting Gaea with fire, which, coupled with an onager attack that Octavian accidentally launched himself from, killing him, finally destroys Gaea . </P> <P> The two camps celebrate their victory at Camp Half - Blood together and stay together until the Romans' return to Camp Jupiter the next day . Nico decides to make Camp Half - Blood his home, and he also reveals his crush to Percy, but decides he has moved on . Jason, having been made a Pontifex Maximus, tells Piper that he will have to visit Camp Jupiter occasionally to make offerings . Percy and Annabeth also plan to move to Camp Jupiter to attend college after they graduate from high school . Meanwhile, Leo, who thought he was dead, revived by the physician's cure, arrives at Ogygia to pick up Calypso, as he had promised when he first left her . No longer bound to her curse, Calypso leaves with Leo into the unknown . </P> <Ul> <Li> Jason Grace--Son of Jupiter </Li> <Li> Piper McLean--Daughter of Aphrodite </Li> <Li> Leo Valdez--Son of Hephaestus </Li> <Li> Reyna Avila Ramírez - Arellano--Daughter of Bellona, praetor of Camp Jupiter </Li> <Li> Nico di Angelo--Son of Hades </Li> </Ul>

Who dies at the end of heroes of olympus
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