So, as of right now I love crossovers between PJO and HP. Though PJO will always be my favorite. I defiantly have a week spot for Greek mythology! So the main idea is that the Gods have had with Voldemort. Hades hates that he cheated death, Poseidon just hates the guy because of what he did with one of his horcruxes that involved drinking that water and being in a lake surrounded by dead people. Zeus doesn't like him cause of the way he and his Death Eaters travel and the marks they leave in his sky. So of course the Gods call on their children from both Camp Half-Blood and Camp Jupiter. Also in this story the Gods are going to have some contact with their children. I don't know where you would fit this in the PJO story line, so please disregard The Lost Hero and say the meant in a different way after the Titan War. Also Percy never lost is watch that turns into a shield given to him by Tyson. All the children of the Big Three are included along with Annabeth, Piper, and Leo. I just couldn't leave them out! So I think that's all you need to know! Please enjoy the story

Disclaimer: I do not own PJO or HP.

It was early morning and most of the camp had yet to rise as Percy Jackson walked toward the Big House. He carefully stepped inside to be met by a bunch of not-so-happy faces. Chiron looked up as he entered. Percy knew he was late and he didn't have any reasonable excuses.

"Glad you could join us." Was Chiron's only remark.

Percy took his seat quickly looking around the room. It wasn't your ordinary head cabin meeting as the only campers there were himself, Annabeth, Nico, Thalia, Piper, and Leo.

"The Gods have issued you a quest," Chiron paused. "along with a few campers from Camp Jupiter."

Everyone exchanged uncomfortable glances with each other. After the war the two camps had been forced to meet as the would have to work together for the oncoming prophecy.

"How can they issue us a quest with war so near?" Annabeth was the first to speak.

"The Gods have a problem they need your help to solve." Chiron answered.

"Just get to the point!" Nico exclaimed frustrated.

"I cannot. They have requested a special meeting with you. You best pack almost all your belongings and I will provide you with ambrosia and nectar. Then you will travel to the Empire State Building with Jason and Hazel." Chiron informed them.

"They are the only two accompanying us?" Piper spoke up.

"It is mainly for the children of the Big Three, but they requested a few ah, special editions knowing how easily their children's tempers can rise." Chiron said carefully.

Again, they all exchanged glances.

"You are dismissed, meet back here in two hours." Chiron ordered.

They all stood to leave while Percy and Annabeth hung back.

"The two of you," Chiron began. "must refrain from trouble. You will be leading this mission and this particular mission must not fail."

They nodded in understanding before hurrying after the others. No one attempted to make small talk as they walked toward the pavilion. Other campers where already there, eating after giving their offerings. They looked towards the group with worried glances as they had already been informed of the peculiar quest. A few 'good lucks' and 'don't get killed' were muttered towards them but no one was in the mood to talk. The group ate quickly, and Percy was the first one done. He hurried to his cabin and threw his things into a bag. Like the rest of the campers he really didn't have much. Mostly jeans and camp t-shirts. His most valuable items were Riptide, who would always return to his pocket, and the watch his brother, Tyson, had given him. He grabbed a handful or two of the drachmas that sat in the fountain, a gift from his father.

When he finished he walked out to the lake that sat besides his cabin. He dove into the water, sometimes it helped him think better. He had a little less than an hour before he had to meet back at the Big House. A school of fish surrounded him quickly, all chattering away. He laughed at them and joined into their pointless games.

"Percy!" He heard a voice and he quickly broke to the surface. All the fish stopped and waited.

"Yes?" He called back. He spotted Annabeth walking out to the pier.

"Come on! We're going to be late!" She shouted furiously.

He quickly swam to the dock and pulled himself up. He'd lost track of time underwater. Dashing inside the cabin he grabbed his bag before quickly helping Annabeth with her own and heading towards the Big House. The two of them arrived right on time and waited on the porch with the others. Percy was glad that when he came out of water he looked like he had never been swimming, he really didn't want to explain that he was playing with fish to anyone but Annabeth.

Chiron exited the house and looked at each of them in turn.

"Are you ready?" He asked them. Everyone nodded. "Then let's go!"

They arrived at the Empire State Building quickly. Outside Jason and Hazel were waiting for them.

"Took you long enough!" Jason exclaimed throwing an arm around Piper and slapping Leo on the back.

Hazel quickly embraced her brother before smiling at the rest of them.

"Please be respectful and don't say anything before thinking it out." Chiron advised before turning to leave.

"You're not coming?" Annabeth asked surprised.

Chiron shook his head. "The Gods will be taking it from here."

The group glanced at each other nervously before entering the doors and heading straight for the elevator. Percy quickly pushed the button that would lead them to the steps of Olympus.

"Be ready for a long climb." He stated as they rose in silence.

The stairs seemed to go on forever and the climb itself was worse. Even worse than that was the fact that they had to face their parents, and do them another favor. Percy was the first to enter, seeing him, Poseidon smiled.

"Welcome Perseus." He boomed.

"Hey Dad," Was Percy's only response.

Athena smiled as her daughter followed Percy. Zeus looked at his two children proudly, a smirk on his face. Hades only glowered at his children, which received rival glowers back. Hephaestus nodded to Leo and Aphrodite beamed at Piper. At least the Gods appeared to be welcoming them.

"Let's get on with this then!" Exclaimed Hera who smiled at Jason.

"Demigods," Hades began impatiently. "this is extremely important. You are searching for a man who's cheated death, looks kind of like an extremely ugly snake, and who's pissed off the Gods! There is supposed to be some prophecy about a boy-who-lived who's been chosen to kill him. Right now he's hunting down the horcruxes…or part of that son of a bitches soul that he's hidden somewhere else. If it's true that only he can kill him, find out and get close to the boy. Your fighting skills will help him…and don't worry! I am preparing a special place in the underworld for him."

"Thank you for that…wonderful description." Poseidon nodded. "We don't really have an guidelines for you except that Percy and Annabeth will lead this quest. You will not have to pose as anyone, the whole school will know exactly who you are. You will train while they are in school by an extremely powerful wizard. You will learn how to fight against them."

Everyone nodded.

"On your arrival, I, along with everyone's parent shall accompany them during your introduction." Hera said. "You will show them what you can do and word will surely reach Voldemort. We must scare him, and we see this is the best way."

"You're not worried?" Annabeth exclaimed.

"They cannot hurt us. We will be most safe, and surely they wouldn't speak of it to the world." Hera stated.

"Why were we chosen?" Leo asked, speaking for the first time.

"You all have a gift." Athena said. "One that will add to this quest."

"Percy," Poseidon said. "the gifts you possess are one of a kind. You are also one of the most powerful demigods ever born and one of the most gifted leaders."

"Nico and Hazel can travel in the shadows, they are Harry Potter's best chance of finding these horcruxes. They haven't left for the big quest yet, but with them along the war shall end must faster." Hades beamed at his children.

"Annabeth is smarter than anyone at that school. Even the girl Hermione Granger, who is believed to be the brightest witch of her age. Annabeth will be attending most wizard classes just to observe, and learn all she can." Athena stated.

"Leo," It was the first time Hephaestus had spoken. "has the gift of fire and he can fix anything. The fire is especially important in ways he must discover himself."

"Jason, Thalia," Zeus smiled for the first time ever. "are powerful demigods and they are quick in battle."

"So we get to my daughter last, do we?" Aphrodite chuckled. "Piper can charm speak people, she can probably get you anywhere in the wizarding world by talking. A gift you will most certainly need."

"As always," Poseidon stated. "I will be there to guide you Percy."

Knowing that his father cared like that Percy couldn't be mad at him anymore.

"Thanks Dad." Percy responded.

"Perhaps you two would like a few seconds alone?" Hera suggested. While she hated most demigods except for Jason, Percy wasn't as bad as the rest. She was beginning to grow slightly fond of him too.

"That would be good." Poseidon nodded.

"Good-bye, demigods." Zeus said dismissing them as they filed out the doors they had come in. The other Gods quickly left through different doors.

"Perseus," Poseidon said seriously. "this quest could be dangerous. Watch out for the wizards who reside in a house called Slytherin, they will try to turn you all against one another."

Percy nodded.

"There is a lake close to the castle. The creatures there are good. When you visit it I will be able to speak with you more clearly."

He nodded again.

"Two more things before I must send you off. The first, there is a boy, Draco Malfoy. You will probably meet him right away, he follows the man Voldemort. Stay away from him until you've had some training. Then you can fight him, and please do kick his ass."

Percy couldn't help it, he laughed out loud.

"Lastly, Riptide will harm these people since they are of magical blood, so they are not considered completely mortal."

"That's good to know." Said Percy.

"Good-bye, Perseus, though we shall meet again very soon."

"Good-bye Dad." Percy said shaking hands with his father. They were never the emotional type. Percy then stopped with his hand on the door. "Oh and hey Dad?"

"Yes, Perseus?" Poseidon replied turning from the other door.

"I'm not mad anymore."

Poseidon cracked a smile before laughing. "That's good to know."

Percy smiled and left. His friends where waiting for him right outside the door. No one asked about what had gone on inside, instead they quickly made their way down the steps.

"How are we supposed to get there?" Thalia asked confused when suddenly Hermes appeared before them.

"Follow me demigods!" He said happily. The travel was by Pegasus, and Blackjack was there waiting for Percy. Instantly striking up a conversation.

Travel was quicker than they thought it would be and they soon landed on the grounds of Hogwarts. A gigantic castle looming above them.

"Go inside, you'll see massive doors that lead to a Great Hall. They are having a feast in there, make an entrance!" Hermes advised before leaving with the Pegasus.

Then ran towards the castle and up the steps before pushing through the doors. They came into a grand hallway, where straight ahead like Hermes had said, were two gigantic doors. They could hear voices on the inside that sounded like someone giving a speech. A few ghosts past through the hallway, upon seeing them they screeched and flew through the doors.