Series Info
Quick Summary: This can kind of be compared to what happens in the Heroes of Olympus, but instead of the Romans, we're replacing them with the Wizards from Hogwarts.
Number of stories: This will be a 5 book series (of course you can shorten it and finish it faster by squeezing the events into fewer books).
Book 1
Story Title: PJO x HP: Frozen in Time (referencing to Hera's prison since Kronos has quite literally frozen her in time)
Plot: This will be similar to the Heroes of Olympus happenings. The first book of this series will start off with Harry waking up in the back seat of a Delphi Strawberry Service van, without any memory of who he is. He is taken to camp half blood, where Hecate claims him (you can choose a different god if you want) and is trained to fight like a demigod. As he's being trained, they learn that Hera has been captured, and Harry, along with a team of Demigods from CHB go on a quest to rescue her. Along the way, they fight a lot of monsters before they finally manage to free Hera. Then they learn the Voldemort and Kronos are rising again and working together to take over both the Magical and godly worlds.
Beginning: Harry Potter wakes up in the back of a camp half blood van with no memory. He goes to the camp, where no one can figure out what happened to him. Soon, he is claimed by Hecate, the goddess of magic. Then they realize that Hera has been trapped by the titan Krios, and receives a prophecy to save her.
Middle: Harry takes his companions (you can pick) and goes on this quest. Along the way, his memories start to return, as he remembers a few familiar faces and his enemy Voldemort, but he can't remember about magic.
End: Harry and the gang reach their destination, where Harry sees Voldemort, alive again and in his shock, remembers about magic. When he remembers, the sword he was wielding suddenly transforms into his wand and he duels Voldemort and disarms him before they free Hera and retreat.
Book 2
Story Title: PJO x HP: Wizard of the Sea
Plot: The second story will be similar to Son of Neptune, and will focus on Percy. He will wake up on the Hogwarts Express with no memory of how he got there and will have to learn magic for a few months while he works with Ron and Hermione to figure out what happened. Along the way, they end up realizing a plot inside the walls of Hogwarts and have to work together to defeat the monsters hidden in the castle, while also working to regain his memories.
Beginning: Percy wakes up on the Hogwarts Express with no memory of who he is, or how he got there. When he reaches Hogwarts, he tries to talk to the professors about his problem, but they are all stumped. As they realize they have no choice now that he is here, they have him join the sorting ceremony, where he gets sorted into Gryffindor.
Middle: Percy is learning to use his magic. He finds himself excelling at potions, but isn't good at Herbology. He also becomes close friends with Ron and Hermione while he's there. One day, the three end up staying back after divination, where Trelawney suddenly gives a prophecy. Percy, Hermione, and Ron take it upon themselves to solve it and realize that an evil being is letting monsters into the school. They start tracking down and defeating these monsters.
End: Percy, Hermione, and Ron discover where the monsters are coming from. When they reach the location, they see a large army of monsters, as well as Kronos present. Seeing Kronos shocks Percy and he remembers all his memories. His wand suddenly transforms into his trusty sword riptide, which he uses to fight the monsters and Kronos. Kronos, realizing that he is being defeated, retreats from Hogwarts, and Percy closes the entrance that was letting him bring monsters there. In the end, Percy explains everything to the other wizards and asks them to prepare to leave for CHB.
Book 3
Title: (Still working on a title)
Plot: The wizards leave Hogwarts and start their journey to CHB. Meanwhile, The 7 of the prophecy (Percy, Harry, their GFs and you can pick the other 3) leave on their own journey to find and destroy Voldemort's Horcruxes so he can be killed. In the end, they realize that the final Horcrux is in Tartarus, and Harry and Percy jump down because they know they have no other choice.
Beginning: The Wizards get ready to travel to CHB, where they'll meet the Greek demigods. Members of the Slytherin house (not all, just Draco Malfoy and a few others) try to cause trouble and sow seeds of doubt within the wizards, trying to make them not trust the greeks.
Middle: After arriving at camp and exchanging stories, the Slytherins causing trouble are sentenced to the CHB dungeon so they can't cause any more problems. The members of the prophecy (Harry, Percy, Their GFs, and 3 others) start their journey to find and destroy Voldemort's Horcruxes while the other demigods and wizards start training together for the battle they know is coming.
End: Percy and Harry solve a riddle leading to the last Horcrux and figure out that it is located in Tartarus. Knowing that they have no other choice, they both jump into the pit, making the other five heroes promise that they will lead the quest to the doors of death, which Percy and Harry will use to escape Tartarus after destroying the Horcrux. Tearfully, the other quest members promise to do so as Percy and Harry fall into the pit.
Book 4
Title: PJO x HP: The Last Horcrux
Plot: Percy and Harry have to travel through Tartarus to find the last Horcrux and destroy it, before making their way to the doors of death to escape the pit. At the same time, the other heroes (Harry and Percy's GFs + the three others you chose) make their way to the mortal side of the doors so they can be there to help when Harry and Percy escape.
Beginning: Percy and Harry land in Tartarus, where they realize a lot of the monsters they defeated have realized their presence and risen up against them. These include the troll from Harry's first year, The Minotaur, Kelli, etc, etc.
Middle: Harry and Percy avoid as many monsters as they can and slowly make their way to the heart of Tartarus, where they realize that the last Horcrux is none other than Voldemort's pet snake Nagini, who he thought would be safe in Tartarus. Along the way, they fight the primordial goddess Nyx as well as the embodiment of Tartarus and make their way to the doors of death, where Nagini waits, guarded by a huge army of monsters.
End: Percy and Harry engage in combat with the army, knowing that they can't take them all on. When it seems like they are about to be overpowered, Bob, Small Bob, and Damasen join the fight on their side and turn the tide in their favor. At that point, the doors of death open, and the demigods from the other side drop in to join the fight. They quickly make short work of the monsters as Harry and Percy focus on Nagini. In the end, they use Percy's sword, riptide, to sever her head from her body, effectively destroying the last Horcrux, before making their way out of Tartarus. (Bob, Small Bob, and Damasen escape as well, but decide not to join the war unless needed during the final battle)
Book 5
Title: PJO x HP: The Final Battle
Plot: Percy and Harry have made it out of Tartarus. Harry, Percy, their GFs, and the other prophecy demigods/wizards make their way to ancient Greece for the final battle with Voldemort and Kronos. The other wizards make their way to CHB to protect the camp from the magical forces Voldemort has sent (his death eaters) while the demigods travel to Hogwarts to defeat the army of monsters that Kronos has sent against the wizards. The chosen defeat Voldemort and Kronos, and when they die, the death eaters quickly stop fighting and surrender, and the monsters, whose life force is tied to Kronos, end up disintegrating.
Beginning: Percy, Harry, and the other members of the prophecy start their journey to Ancient Greece, where they must fight Voldemort, Kronos, and the other titans that have been brought back. Along the way, they are attacked by numerous groups of monsters sent to stop them.
Middle: The demigods and wizards realize that the enemy has played by their weaknesses by sending forces they cannot hope to defeat. The Titan Krios leads an army of monsters to destroy Hogwarts while Voldemort sends his death eater forces to attack the camp. Since demigod weapons don't affect mortals and magical spells aren't very effective against monsters, the demigods and wizards are left with not many options.
End: The demigods from CHB make their way to Hogwarts, where they defend the Wizards' home from Krios and his monster army. The Wizards stay at CHB, where they defeat the Death Eater forces sent by Voldemort. Meanwhile, the members of the prophecy arrive in Greece where they make their last stand against the remaining titans and Voldemort. Percy fights Kronos and defeats him and Harry kills Voldemort. As Kronos is sent to the void, the monsters, who were tied to his life force, end up disintegrating, and Hogwarts is saved. The Death Eaters surrender once they realize their master has been killed. In the end, the enemies are all tried in front of the Olympians and the heroes receive prizes from the gods.