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The Second Giant War was a series events relating to the rise of Gaea and her children, the giants. Like its predecessor, the Second Giant War was fought between the Olympians and the giants, with the Prophecy of Seven being its focal point.
First Giant War
World War II
While the gods were fighting among themselves during World War II, Gaea used this as an opportunity to once again usurp the Olympians by raising the giants to oppose them. She appeared to Marie Levesque, a lover of Pluto, and lured the woman to Alaska with her daughter Hazel. Now beyond the power of the gods, Gaea began possessing Marie and forced Hazel to revive Alcyoneus by calling up riches from the earth. On the night that Alcyoneus was supposed to rise on a phantom island, Hazel sacrificed herself and her mother to delay the giant's rise by destroying the island.
Eventually, Gaea also learned of the individuals who would be a part of the Prophecy of Seven. While Hera tried to bring the seven together, Gaea tried to break their spirits. She learned of Leo Valdez's role in the prophecy from Medea, a sorceress with the ability to see the future. When Leo was still a child, she trapped his mother inside a factory and approached Leo. Leo tried to protect his mother using his fire abilities, but it caused the entire warehouse to go up in flames, resulting in the death of his mother. Gaea remained mostly silent after this, staying quiet as the Titans began to rise during the Second Titan War.
The events of the Second Titan War and the Great Stirring cause Gaea to reawaken once more. She begins reviving the giants to oppose the gods once more, and has Alcyoneus chain Thanatos in Alaska, thereby giving monsters the ability to reform much quicker upon death. In Thanatos' absence, Gaea takes control of the Doors of Death, allowing any deceased soul or monster allied with her to return to the mortal world and serve her cause.
Second Giant War
Khione then used her charmspeak ability to lure Hera into the Wolf House where she was trapped in a cage by Gaea giving her a choice. She could either marry Gaea's son Porphyrion or let the earth consume her life. Desperate, Hera sends a signal to the demigod Annabeth Chase and told her to go to the Grand Canyon and the boy who had a missing shoe will be her boyfriend Percy Jackson. However, when she arrives, she finds the demigod Jason Grace instead. Annabeth is furious and questions Jason and his friends on where Percy was and Jason and his friends had no idea on what she was talking about. So Annabeth and Butch takes Jason and his friends to Camp Half Blood. Later, Hera gives Jason another call when he was in the Big House in Camp Half Blood. She says that Jason must free her before the winter solstice which was in four days otherwise it would be over. Hera also appears to Leo Valdez and Piper Mclean as well.
Later, when Jason, Piper and Leo go on a quest to free Hera, they find her in the Wolf House where the Hunters of Artemis were fending off monsters such as Earthborn and storm spirits. Suddenly, Khione the snow goddess appears and freezes the Hunters. Jason jumps onto a storm spirit called Tempest and uses him to destroy most other storm spirits while he smacks some of the wolves on the head with a wooden board. Leo fends off Khione forcing her to retreat while Piper takes care of the Earthborn. However, before Hera could be freed, Porphyrion gets free from his cage. Jason fights him while Piper charmspeaks Gaea to sleep and Leo frees Hera. Jason was about to get killed by Porphyrion but Leo and Piper freed Hera in time who unleashes her divine form forcing Porphyrion to retreat and extinguishing all the monsters. However, Jason saw her divine form and nearly got killed but Piper charmspoke him back to life. After that, The Hunters of Artemis go away while Hera uses her power to send Jason, Piper and Leo back to Camp Half Blood.