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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

In ancient times, the giants rose from Tartarus to fight and destroy the gods. The giants were blessed that they could only be killed by a mortal and an immortal working together. The giants were formidable foes. The gods initially struggled against the giants, with Zeus even becoming afraid of the enemies. Later, with the help of Heracles and Dionysus, the strongest mortal heroes of the time, the gods were able to kill all the giants.

The Rise of Gaea

World War II

While the gods were fighting among themselves during World War II, Gaea used this as an opportunity to overthrow the Olympians by reviving the giants. 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.

Gaea's Stirring

Gaea, protogenos of the earth

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.

The goddess of snow, Khione, also joins Gaea and uses her charmspeak ability to convince Zeus to close Olympus off from the world, thereby leaving the demigods on their own to face the giants.

Second Giant War

Freeing Hera

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.

On their quest they encountered several minions of Gaea. The Cyclops', Ma Gasket and her sons, Sump and Torque, tried to the demigods with salsa. Leo killed them but they were quickly coming back to life. After that they encountered Medea who Piper defeated and they rescued Gleeson Hedge. Then the crash landed near King Midas' and Jason fought his son, Lityerses. After that the group was ambushed by Lycaon and his wolves but were saved by Jason's sister Thalia Grace. The group rescues Piper's father, Tristan McLean from Enceladus.

Khione, the goddess of snow.

Finally, 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.

Releasing Thanatos

Meanwhile, Percy had been transferred to Camp Jupiter for a "trade" according to Hera. He is pursued by the gorgons Stheno and Euryale who believe that he had killed their sister Medusa despite Percy saying he couldn't remember anything at all. Percy is rescued by Frank and Hazel who take him to Camp Jupiter after he destroyed the gorgons. Juno then appears to them and told them that Percy was very special and that an army will be invading Camp Jupiter by the Feast of Spes. Reyna the praetor accepts him into Camp despite the fact that it looked like she wanted to run him through with a sword. Percy is recruited into the Fifth Cohort which at the time was the worst cohort to join. Percy gets a tour around Camp by Hazel and meets Octavian, the augur who blackmails Hazel into voting for him to become praetor as the previous praetor, Jason Grace had disappeared. Octavian also believes that Percy is a graecus or Greek and believes that he is a spy for Gaea.

Later that night, Camp Jupiter participates in the War Games and surprisingly, the Fifth Cohort wins and manages to capture the other cohort's banners first. However, Gwen is stabbed in the back, presumably by Octavian after the War Games. However, Gwen somehow revives and Mars appears, saying that Thanatos had been captured by Alcyoneus the eldest giant. He says that with Thanatos, the god of death captured, monsters will not be confined to Tartarus and Gaea will also allow mortal enemies of the gods to come back to life. He announces a quest to free Thanatos and chooses his son Frank as the leader. He also says that Percy must go on the quest and allows Frank to choose the other participant. Frank chooses Hazel.

The next day, Camp Jupiter has a brief meeting before Frank, Percy and Hazel set off. Octavian provides them with a small ship to travel with. The trio set off and travel several hundred miles before night falls and Hazel passes out. The trio settles down and encounter the monster army which was invading Camp Jupiter led by the giant Polybotes. Percy, Frank and Hazel manage to remain unseen but Percy becomes sickened at the sight of Polybotes due to the fact that Polybotes was the bane of his own father. After the army disappears, Frank and Hazel settle down at a small shop to cure Percy. However, Polybotes had dropped down several basilisks. Frank engages the snakes while Percy and Hazel hurries to the shop. Frank manages to escape but his bow had been disintegrated. In the shop, the trio encounter Iris, the goddess of the rainbow who manages to cure Percy. She tells Frank about his family gift but Frank doesn't understand. He also tells Frank to seek out the seer Phineas as he can tell them about the quest.

Alcyoneus, giant of the undead.

When they get out of the shop, Frank manages to defeat the basilisks and the goes to Portland to find Phineas. However, the seer refuses to give them the information they need unless they give him the red Harpy Ella. Percy bets then bets with him to drink Gorgon's blood. If Phineas wins, he gets his eyesight back. If he doesn't he needs to give Percy the location of Alcyoneus's lair. Phineas ultimately loses and Percy Frank and Hazel get the information they want.

Percy then seeks out Reyna's sister Hylla Ramírez-Arellano who is the queen of the Amazons. It is here revealed that Reyna and Hylla's home was destroyed by Percy in The Sea of Monsters. Hylla throws Percy and Frank into prison and Hazel pleads for her to help Camp Jupiter. Hylla explains to Hazel that Gaea had brought the former queen of Amazons, Otrera back to retake the Amazons and drive them into war with the demigods.

Hazel manages to convince Hylla to help her escape and she manages get Frank and Percy out of prison with the help of Arion, the fastest horse in the world. Hazel Frank and Percy continue travelling on Arion until the horse gets tired. Frank realizes that this is near his grandma's home so the trio goes there in hope of food and a place to sleep. However, the house is surrounded by Laistrygonian Giants. Frank with the help of his spartus Grey, who was a gift from Mars, Franks's father, manages to defeat a few giants and cut through to the house.

Frank met his dying grandmother and his father Mars who both told him about his family gift and how it is his only chance of survival. The next morning, Frank, Hazel and Percy manage to escape but Frank's grandmother is presumably killed.

Frank, Hazel and Percy then travel to Alaska to find Thanatos. The trio manage to defeat Alcyoneus who was guarding Thanatos with the help of Frank's family gift. They are then able to return back to Camp Jupiter in time to save it from the invaders. Percy then becomes praetor because he defeated Polybotes and saved the demigod camp.

Finding the Athena Parthenos

When the people of Camp Half-Blood arrived at Camp Jupiter things seemed to go well. Until Leo fired at the camp due to being possessed by an eidolon. Now the camps are going to go to war and the gods are split between their Roman and Greek counterparts. Annabeth figures out that she needs to find the Athena Parthenos to unite the camp.

Meanwhile, Ephialtes and Otis have kidnapped Nico di Angelo in a jar because he knows about the Doors of Death. After a while, the ship was attacked by Chrysaor and his dolphin warriors. They manage to defeat them by using the trickery of Frank and Dionysus.

Arachne, spider weaver.

Annabeth followed The Mark of Athena to Rome, where she found the statue guarded by Arachne. She managed to trick the monster into sewing chinese finger trap all while she had a broken leg. At the same time, Jason and Percy managed to defeat Otis and Ephialtes with the help of the Argo II in the Colloseum and Bacchus finished them off. But when Percy reunited with Annabeth, they both fell into Tartarus, but this was actually good because they can close the Doors of Death.

Closing the Doors of Death

Tartarus, Protogenos of the pit

While in Tartarus, Annabeth and Percy meet Iapetus (also known as Bob), a former titan who was brainwashed by Percy. He believes that Percy had called for his help when the former was actually screaming in pain. Bob helps them defeat many monsters in the pit including several empousa and a flock of Arai. Bob also took Percy and Annabeth to see Damasen, an amiable giant with exceptional healing powers after Percy was critically injured by the Arai. However, they had to leave quickly due to the trio being pursued by other giants and titans whom had been sent to Tartarus by them and other demigods like Jason. Damasen and Bob however have discussed Bob's plan to use the death mist to conceal the two demigods so that they could be smuggled back to the mortal world. Damensen doesn't believe the plan will work but Bob thinks it is their best shot so he takes them to see Akhyls. The goddess hides them in the death mist but then tries to kill the demigods. Percy managed to defeat her by controlling her poison and using it against her and then chases her off. After that, Nyx and her many children arrive to kill the demigods but Annabeth tricks her and they run away.

The remaining members of the Seven were travelling to Greece to help Annabeth and Percy close the doors of death from the other side. They are attacked by a number of enemies such as the Ourae, in which they escape from and Sciron and his giant turtle, whom they manage to defeat through trickery. They also arrive at Diocletan's palace to retrieve his sceptre. They meet Cupid there and he reveals Nico's homosexuality but they manage to retrieve the Sceptre. Later, they arrive at Greece and destroy thousands of monsters with the help of the undead Roman Legion to reach The Doors of Death but Leo and Hazel were separated from the rest of the group during the battle.

In Tartarus, with the help of the death mist, Annabeth and Percy manage to sneak past many monsters and titans. They soon arrive at the Doors of Death, where many monster are waiting to get through to the mortal world. However, Tartarus arrives and destroys Krios and Hyperion, the titans guarding the Doors of Death. Bob and Small Bob defend Percy and Annabeth but they are both soon defeated by Tartarus. Just as Tartarus is about to kill Bob, Damasen then arrives and along with Bob, they sacrifice themselves to let Percy and Annabeth go through the Doors of Death.

Meanwhile, Hazel and Leo are attacked by the sorceress Pasiphae and the giant Clytius. Hazel manages to defeat Pasiphae on her own by shifting the Mist and tricking her but then is nearly knocked out by Clytius. At that time, Percy and Annabeth had just got out of the doors of death and because they still weren't fully recovered from Tartarus, they were both weak and unable to fight. Then, the rest of the seven and Nico arrives as well as Hecate and through combined efforts, they manage to defeat Clytius.

Reyna also arrives at Greece, but since she and her pegasus were constantly under attack by monsters, her pegasus dies. She then volunteers to go with Nico Di Angelo and Coach Hedge to return the Athena Parthenos to the Greeks as a peace offering.

Final Battle

Reyna, Nico and Coach Hedge set off to return the Athena Parthenos while the Seven set off to the ancient lands. The stop at Odysseus' palace where all the suitors of Penelope had gathered, revived from the dead by Gaea. Jason, Piper and Annabeth go to the palace, disguised as suitors to try and find out more about Gaea's plans. However, their cover is blown by the infamous praetor Michael Varus. The three manage to defeat most of the suitors until Michael Varus stabs Jason in the back but is in turn killed by Piper. Hera then appears but says that she couldn't heal Jason much to Piper's dismay. She then says she has to go as her husband is currently hunting her down.

Meanwhile, Reyna, Hedge and Nico encounter Lycaon and his wolves who are currently working for the giant Orion. They manage to kill Lycaon and then shadow travel away before Orion arrives.

The seven also encounter a large storm on their way to the ancient lands which nearly destroys the Argo II. The nearly completely healed Jason and Percy Jackson try to find out what is happening under the sea. Percy dives in, soon followed by Jason after he managed to capture a storm spirit so that he could breathe underwater.

There, they meet Kymopoleia, who is the one causing the storm and the giant Polybotes. Percy attacks Polybotes but is defeated by Polybotes poison which had a sickening affect on sons of Neptune/Poseidon. Jason then fights Polybotes but is unable to defeat him without the help of a god. Therefore, he convinces Kym to help him by offering to give her a cabin at Camp Half Blood as well as many other offerings such as an altar, which outshined the what Gaea was willing to give her. They manage to decapitate Polybotes and Jason then reveals the storm spirit helping him who is revealed to be Dylan. Kym and Jason then have a brief discussions about their plan to defeat Gaea.

Reyna Hedge and Nico encounter Orion again but this time, they were kidnapped by The Amazons and The Hunters to lure him into a trap. However, Orion surprise attacks them and kills most of the defenders. The remaining ones hold him off as Reyna and her comrades escape. They soon encounter Bryce Lawrence who had orders from Octavian to capture Reyna. Bryce uses undead members of the Roman Army to attack them but they are defeated by Nico, who sends him to the underworld, defeating him.

After getting the Physician's Cure from Asclepius, the seven then attack the giants planning to revive Gaea at the original Olympus. The demigods are nearly all defeated until the Olympians come and with the help of the demigods, defeat the giants. However, Percy's nosebleed touches the sacred altar and awakens Gaea.

Reyna Nico and Hedge encounter Michael Kahale, Dakota and Laila and they try to arrest them but Kahale is taken out by Tyson and the other demigods agree to help them. Hedge and Nico set off to destroy the onagers that the Romans had set up but once they are gone, Orion attacks Reyna once again. However, this time with the help of Bellona and Athena, Reyna manages to defeat .

Nico meets up with Will Solace and several other campers from Camp Half Blood and together they try to disarm all the onagers. However, they are discovered by the Romans but distract them for enough time for the Greeks to attack the Romans. However, before they could attack, Reyna returned with the Athena Parthenos. Upon seeing this, the monsters Octavian brought along turned against the legion and the Greeks and the Earth mother Gaea awakes as blood was still dropped on Mount Olympus. She summons more waves of monsters who start overwhelming the campers but is later defeated when Jason, Leo and Piper use Festus to lift her into the air so she loses most of her power. Piper charmspeaks her to sleep while Octavian fires and onager shot which hits Gaea, defeating her but also apparently destroys Festus. The other campers then defeat the armies of monsters and force the remaining to flee. However, during this final battle, Leo is supposedly killed.


Due to the physician's cure, Leo was killed, but was resurrected by Festus and taken to Ogygia. There, Leo keeps his promise to set Calypso free and takes her away. Meanwhile, at camp, the two camps united, but demigods from both camps were worried about Leo, who supposedly died in the battle with Gaea. The demigods focused on meeting new friends and cleaning up as well as giving the dead a funeral. After a few days, the Romans returned to Camp Jupiter and all of the demigods planned for the future.

After the conflict with Commodus, Caligula, Nero and Python, Nico di Angelo decided to return to Tartarus to search for Iapetus. Though Iapetus was believed destroyed helping Percy and Annabeth escape through the Doors of Death, Nico experiences a voice calling to him from the realm that he thinks might be the Titan calling for help. The son of Hades decides to try and find out what happened to his friend and to help Iapetus if he can.