A/N: Hey guys, this is my first fanfiction, so plz dont be mean! :) Wait, actually, me and my friends wrote it together, so yea. Please read it and review and tell me what ya think. Thanks! :) Oh, and please read the prologue before you read Chapter 1!

Disclaimer: I DO NOT own Percy Jackson or Harry Potter, Rick and J.K does!

~Percy Jackson & Harry Potter's Second War PART 1~

Prologue

The moon shone brightly, and the Hogwarts grounds were empty. The tomb of Albus Dumbledore was pale against the darkness, and there was silence.

The inside of Hogwarts castle, however, was a different story altogether.

The hallway was dark. All of the classrooms were lined up on the left and right. Professor McGonagall was walking down the corridor, waving her wand toward each of the rooms in turn, muttering 'Nox' and each light went out.

The professor made her way to the – underneath the staircase that ascended up to the North Tower,( also known as the Divination Tower), where, as usual, she could hear the wind and the trees beating up against the windows, for the teacher who taught up there, Professor Trelawney, refused to open the windows even when it was over 100 degrees. In Professor McGonagall's opinion, she was a complete lunatic. Still, she'd felt bad for her when she got sacked, and then again after the war, with so many casualties left behind. Now, it was back to stage one.

The transfiguration teacher had just turned her back on the stairwell when she noticed something odd. The whole corridor was filled with talking portraits (as usual), but every single one of them, instead of being asleep or trying to act asleep, was awake, whispering into each other's ears. The last time something like this had happened, it had been the war with Voldemort, and all the pictures had been arming themselves with weapons, trying desperately to kill Death Eaters, but failing and only swatting at air, waving torches helplessly, looking like madmen who were chasing a flock of chickens that had escaped.

As soon as she turned towards them, they subdued their talk, and looked in different directions, scratching their heads and yawning, trying to make it seem like they had just awoken. One man, however, must have problems in processing things fast (he happened to be Oliver the Oblivious, for he kept tapping his neighbor, and pointing up the staircase).

Minerva McGonagall looked sideways at the pictures, (who were now trying to snore to show that they were asleep), and then slowly started to climb the stairwell, noticing the deep gouges in the wood from the aftereffects of the battle.

Her feet touched the last step, and fingers trembling, she pushed the door open. With the creaks of the door, it parted, and she stepped inside.

Immediately, the smoke and the fumes that were inside covered her eyesight and she tried in vain to catch sight of a figure. But the only image she saw were rows and rows of crystal balls. Hesitantly, she took another step, and blinking her eyes, she scanned the room. At the corner of the room, there was a hunched figure, moaning in agony. The next thing Minerva knew, she was running towards Professor Sibyll Trelawney and spinning her around. What she saw made her back up and stumble over one of the crystal walls she had knocked over in her rush.

Sibyll's eyes were glowing green, and green mist was swirling around her. And out of her mouth came the weirdest words:

Two separate worlds will come together,

'To re - heal the once bloodshed world better.

Three and the wise one's army shall destroy the once-dead,

While seven shall perish the ancient immortal's head.

However, chaos shall come once again,

To be saved by the cursed wand and pen.'

Her eyes turned back to the normal color, the mist dissipated, and she promptly fainted.

The sun was rising over the camp when the wind started blowing furiously, and something strange occurred. Chiron was wheeling out of the Big House, (checking to see whether there were any campers awake, for his horse tail was in curlers) with the sun's light shining on him. He bent down to get out of the wheelchair form, and into centaur form when the light darkened. Thinking that Artemis had gotten mad at Apollo, and covered the sun with the moon, he looked up to see a bunch of curly red hair and glowing serpent green eyes staring back at him.

It was the oracle at camp; Rachel Elizabeth Dare.

She had become the oracle at camp only recently, but she'd already helped the campers with their prophecies, destinies, and quests. On the occasional occasion, when she wasn't spewing prophecies, she was a normal teenager who fought for the wild and loved to draw. Now wasn't one of those times.

Her mouth was slightly agape, and the words were flowing steadily from her mouth:

Two separate worlds will come together,

To reheal the once bloodshed world better.

Three and the wise one's army shall destroy the once-dead,

While seven shall perish the ancient immortal's head.

However, chaos shall come once again,

To be saved by the cursed wand and pen.

Chiron steadied her as she fell, and deposited her in the infirmary, dodging Will Solace's questions, and hurried back into the Big House. The moment he sat down (or tried to, being a centaur), an Iris-Message appeared. A face of another centaur appeared.

"Chiron!" The image wasn't steady, but he could see the face of his old centaur friend, Firenze.

"Oh, hello! Firenze, am I right? I assume you contacted me about the prophecy?"Firenze's mouth gaped open. "You…how did you know?"

"I tend to know these things, considering the fact that you called me right after my oracle relayed the… message to me."

"So, you know…?"

"Yes."

"And…are you sending your campers to Hogwarts?"

"That will be a matter between my camp director and me."

"Should I inform Professor McGonagall all of your arrival?"

"Yes, that will do."

Firenze nodded, and passes his hands (hooves) over the Iris message, and Chiron was left staring at a wall covered with pictures of demigods who had survived quests. Would they survive this one?

Firenze was galloping in his rush to find the Headmistress' office. He paused, panting, at the door, and gave the password to the gargoyle (Lemon Drop, to honor Dumbledore), and it parted to let him in. Professor McGonagall was sitting at her desk legs crossed, and was staring at Dumbledore's picture on the wall, which was asleep. Her cat form seemed to be half in action, for her features at the moment seemed cat-like.

She looked up when she saw Firenze. He was out of breath.

"I…told…the…them. And…he…he's…coming." Minerva was in confusion.

"Told…who? Wait... you don't mean…"

Her face went slack. "You, Firenze, after I placed trust in you and confided in you, told somebody else about this matter?! Why in Merlin's beard would you ever do that?" She was really angry now, her face was turning red.

"Please, Headmistress, I have not betrayed your trust. I am an honorable centaur." He drew himself up to full height (which was not a lot, considering the fact that he was pretty short, even for centaur standards.).

"I told another fellow centaur, whose name is Chiron. He has received the same prophecy as you."

Minerva's eyes were wide. "Does he understand it? Does he know what it means?"

The corners of Firenze's mouth were lifting into a rare smile. "He does, and he has promised to send some of his campers here to Hogwarts. He believes that they will be part of fulfilling the prophecy."

"Campers? Who are they?"

"They are not any ordinary campers at a random summer camp. These kids have been trained in the martial arts, as you would call it. They practice sword-fighting, archery, wrestling, racing, and have already undertaken many dangerous quests and have successfully won a war against Kronos, the Titan Lord in Greek Mythology. He is said to be more powerful than Voldemort."

The Headmistress's expression was priceless. She seemed to be deep in thought; lost in another world. A little cough from Firenze brought her back.

"You say that they follow Greek Mythology? But how…how could we have not known? We are both two powerful worlds. We should have known about their existence."

"Both of our worlds are very well hidden, yet Dumbledore knew Chiron very well. In fact, they have met each other quite a lot of times in the past. And now he is Sending 5 of his campers here, and they are special; they are demigods. One of their parents is one of the gods on Olympus."

This seemed like too much for the elderly professor, but at the last moment, she seemed to get it back together. Taking a deep breath to calm herself down, she turned once more to Firenze.

"But nobody must know that they are demigods. We will say that they have come from a wizarding school from a different country –"

"America."

"That is fine. For if our two races get to know what the other is, then there will be mass chaos, I can guarantee that."

Firenze nodded. "We should inform the other staff of their arrival."

Professor McGonagall seemed lost in thought once again, but when she snapped out, all she said was, "You may go now. I need some time to think alone."

And so as the tip of the centaur's tail vanished behind the door, the Headmistress had only one thought in mind, "Dark times are coming once again. We must have the courage to fight back."

Chapter1

- Percy's POV

"Aaah!" I jerked awake as I found a beautiful, gorgeous girl stepped into my cabin. She had golden blonde hair, a nice tan, and stormy gray eyes, yet startling and beautiful. She shrieked as I pulled her in next to me. Wait, did I mention that Annabeth and I are dating officially? "I don't want to wake up," I moaned, "Just give me 10 minutes." Then finally, Annabeth relaxed in my arms. I closed my eyes, not wanting to move.

Then what seemed for, like, 0.00001 second, Annabeth said, "Perce, it's past 10 minutes. We really have to go now. Chiron's going to wonder where we are. And he's going to send someone. Do you really want someone to catch us like this?" I thought about it, and grumbled. "Fine, fine, fine." She smirked and said, "Get changed, Seaweed Brain." So, I dressed into a dark green shirt, a pair of jeans, and a pair of sneakers.

We stepped out of the door, heading for the Pavilion. Then, someone wolf-whistled as we descended down the staircase. "Shut up.", I muttered. I said bye to Annabeth and quickly kissed her on the cheek as she walked to where her siblings were. I sighed and sat down on the bench beside the Poseidon table. I ordered for a blue cherry coke as plates full of bacon, scrambled eggs, pancakes, and other foods. I put the bacon and the scrambled eggs on my plate and left to the brazier to sacrifice.

"Dad, thanks so much for helping me and my friends defeat Kronos. And…. You approve of Annabeth right?" I silently prayed. I walked over to my table and started stuffing the food into my mouth. Let me explain. My appetite grew bigger after the war with Kronos. I guess it really tired me out, you know, fighting Hyperion with my water powers, sword-fighting with Kronos and Ethan, flying on blackjack to kill the flying pig. It wasn't that big of a deal, you know. (Note sarcasm) I finished my breakfast and told Annabeth to meet me after breakfast as she smiled at me. It just makes my day to see her smile like that.

Then that happiness ended as a group of people came up to me and clapped me on the back, saying, "That was so AWESOME how you killed Kronos, dude!" I forced a smile, even though I felt like a dead puppy inside.

I'm serious, everyone always announces, "The hero of Olympus, Perseus Jackson!" or "Percy, you saved the world!" and claps me on the back. But, the thing is, when someone does that, it should make me proud, but I actually feel really upset. Why? Because I didn't save the world. I didn't defeat Kronos. I didn't kill the flying pig. My friends helped me. So many of them died trying to help me. And when people give me compliments like that, I really feel frustrated and guilty. I hope all of them got into Elysium because they helped me saved the world. They're my companions, my friends and family. I'm just really glad that Kronos was defeated because if he wasn't, then, I would explode right this moment. Because so many sacrificed their precious lives to help me kill him and if he's alive and come back to ruin the world again, there was no point dying.

Then that thought reminded me of something. Or should I say someone: Jason and Piper. They've gone to a quest, like, 2 months ago, but they still haven't come back yet. I wonder if they're… No, I don't want to think about it. But what if they are? Just then an unfamiliar boy wearing a Greek armor with blonde hair came running towards me.

Remember, please review! Here's

Me: Hey, Perce, im so sorry, i hav to get writing fanfictions so i can write romantic scenes for you and Annabeth.

Percy: Yea, i was a little bit upset bout that, but ya kno, im chill. Dont worry bout it.

Annabeth: Yea, you'll get used to it, Christy.

Percy: Annabeth, i never saw you so forgiving. I shoulda recorded that and labeled, 'First time, Annabeth forgiving someone'

Annabeth: i always forgive people!

Percy: No you dont.

Annabeth: Yes i do.

Percy: You kno what, lets just hug and get over it.

Annabeth: Ugh, fine.

*Hug

So that was the end of our Percabeth arguing scene! I promise i'll do this for every chapter. :) Oh, and did I mention that Im Percy's little sister? Well, if I didnt, I apologize. Hope you liked it!