A/N-I'll be honest with you guys, I originally wrote this story for my own entertainment and nothing more. I hadn't even planned on publishing it, but then I thought, 'what the heck, why not' and did it anyways. I did not at all expect to get over 70 freakin followers like what the actual heck?! Thank you guys sooo much! I never though this many people would enjoy my ramblings of a story! And thank you so much to everyone who had reviewed! Every single one of them makes me so very happy, and I really appreciate it. Feel free to give me story suggestions in your reviews. While I will by no means use every single one of them, if I see a really good idea then who knows, it might show up in the story. I've even gotten a few suggestions that I had already planned on doing. Wow, this author's note got way longer than I intended…so sorry about that. Some of you probably skipped it anyways though. Well, on to the story! Enjoy!

"blah blah"- Speaking Greek

"[blah blah]"- Speaking Amestrian

'blah blah'- Thinking

***** - Begin/end flashback

Disclaimer: I do not own Harry Potter, Fullmetal Alchemist, or Percy Jackson. Good thing too, or they wouldn't be nearly as good as they are now. They belong to J.K. Rowling, Hiromu Arakawa, and Rick Riordan. Just to be safe, I also don't own the song 'This is War' by Thirty Seconds to Mars.

Harry

"Oi, Harry, do you hear that?" Ron's voice jolted Harry from his half-asleep state.

"Huh? What?" Harry sat up and rubbed his eyes. "What is it Ron?"

Ron was standing by the door. "I hear something down in the common room. It sounds kinda like a voice. C'mon!"

Harry got out of bed, fumbling for his glasses. The two boys stumbled into the common room, where they froze in shock. Percy, Nico, and Thalia were still sitting around the fire. On the floor swirled a green mist, and a decidedly creepy voice seemed to be coming from it. Harry and Ron heard the voice say, 'this is war' before it swirled into the air and dissipated. Harry stared in shock. The three around the fire hadn't noticed them yet. Ron fixed that.

"What the bloody hell was that?!" He yelled.

Percy, Nico, and Thalia whirled around to face them, their eyes wide.

"Shh!" Thalia hissed. "You're going to wake everyone up!"

"WE are going to wake everyone up?! What about you and all your crazy smoke and creepy voices?! And you haven't answered! What the bloody hell was all that?!"

The three Americans looked at each other in hesitation.

"Could we…get back to you on that?" Percy said weakly.

Ron stared in disbelief. Harry managed to snap himself out of his daze and say something.

"Was that some kind of magic?" He asked warily.

"Well…it's complicated," Thalia hedged. "Look, can we…explain in the morning? Please? It's late, and I'm sure Hermione would like to hear it too."

Ron looked like he was about to protest, but Harry grabbed his arm before he could.

"All right, but you'd better explain." Harry pulled Ron back into the room.

"Harry–" Ron began.

"Look, Ron, if we had pushed them to explain right away then they probably would have just lied. If we give them some time to think about it, then maybe they'll decide to tell the truth."

Ron looked skeptical. "What makes you think they won't just lie anyways?"

"They might. But let's at least give them a chance. Besides, they were right about one thing. Hermione will want to hear about this."

Harry climbed back into his bed. Several minutes later, as he was drifting off to sleep, he heard Percy and Nico enter the room.

~o~O~o~

"Alright, you promised an explanation." Ron confronted Percy and Nico before they had a chance to escape to the common room.

"Can't we at least eat breakfast first?" Percy whined.

"We have class right after breakfast. Explain quickly, and you'll have time to eat." Harry was just as determined as Ron to get answers. He only hoped that his new friends would decide to tell the truth.

Percy sighed. "Fine. We should wait for Thalia and Hermione though.

The four boys walked down to the common room and waited around the fire. Most of the other Gryffindors were already at breakfast, so they had plenty of privacy. It didn't take long for Hermione and Thalia to descend the stairs from the girls' rooms.

"Alright, we're all here. Now explain," Ron demanded.

"What's this all about?" Hermione asked with a frown. "Explain what?"

Harry hurried to fill her in. "Last night, these three," he gestured towards Thalia, Nico, and Percy, "were doing some weird sort of magic. There was green smoke or something, and a really creepy voice."

Hermione's frown deepened. "Green smoke and a creepy voice?" She turned to the culprits. "What were you doing?"

The three looked at each other, a look of resignation in their eyes. Thalia spoke.

"We didn't want to have to tell you anything, but we've decided that we should." Nico and Percy nodded in affirmation.

"Tell us what?" Ron asked, exasperated.

"We're getting to that!" Thalia sighed. "Well, what you saw…it wasn't exactly magic."

"Not magic? What else could have caused that?" Harry asked.

"Well…where do I start…" Thalia muttered. She sighed again. "It has to do with us speaking Greek. And being dyslexic. And not enjoying heights."

Harry, Hermione, and Ron looked at each other, perplexed.

"Where are you going with this?" Hermione said slowly.

Percy fidgeted slightly. "Remember when you said it was almost like we were related?" Percy took a deep breath before continuing. "Well, you weren't exactly wrong."

One very long and confusing explanation later, Harry, Hermione, and Ron were speechless. Harry's mind was whirling with all of the new information. Greek gods? Prophecies? He had thought that he couldn't be surprised anymore after being exposed to the magical world. As it turned out, he was wrong. Very, very wrong. He would have accused them of lying, but he could see the grim seriousness in their eyes. And it was highly unlikely that they had fabricated everything. Hermione didn't seem to agree with his reasoning.

"That's ridiculous!" She protested, her voice going up an octave, the way it always did when she was stressed. "There's no way any of that can be true!"

"Well, I didn't think you would believe us right away." Nico said. "But it's true. I know, it sounds ridiculous, but we aren't lying."

"But–but there's no way that any of that is true!" Hermione seemed desperate.

"Hermione, I know this is hard to believe," Thalia said calmly. "But think about it logically. What reasons would we have to lie to you about this? And look at the evidence. Everything that seems weird about us has an explanation."

"Except for Percy's eating habits," Nico cut in. Thalia's mouth twitched, but she managed to keep a straight face.

Hermione looked like she was struggling for an explanation. "It's just–I don't know how this could be possible." She turned to Harry and Ron. "What do you think?"

"I think they're telling the truth," Harry said slowly. "I don't see any reason for them to lie. And this does explain all of the strange things about them."

Ron frowned. "I don't know. I don't know much about Greek gods or myths, but their story seems…." He paused. "Well, I've never heard anything like it before, but it seems like it could be true. All of their explanations seem to make sense."

Suddenly Hermione's eyes widened. "Wait a minute! Your divination teacher–was she the one who gave you the prophecy?!"

Thalia nodded. "Yes, But don't call it divination. It was a real prophecy."

"So her name…Delfon ton Manteio? That was Greek, wasn't it?"

Percy smirked. "Yep. That's Ancient Greek for Oracle of Delphi."

Hermione bit her lip, processing this new information. "I still don't know. Why did you decide to reveal all of this? You could have easily come up with a believable excuse. You could have passed it off as some sort of magic. Why did you decide to tell us?"

"Well," Nico began, "We weren't originally planning to. We decided to because of the prophecy."

"What did the prophecy say?" Ron asked eagerly. "We didn't hear all of it last night, just the last line: this is war."

Thalia pulled out a sheet of parchment. "This prophecy is longer that most, but we were able to write it all down." Taking a deep breath, she read the prophecy aloud. "A warning to the people, the good and the evil, this is becoming a war. To the soldier, the civilian, the martyr, the victim, this is already war. A warning to the prophets, the liar, the honest. It's the moment of truth, the moment to lie, the moment to live, the moment to die, the moment to fight. To the edge of the earth, from the last to the first, you will fight to the death. This is war." She laid the parchment out in front of them.

Nico pointed to the line 'the moment of truth'. "We think that this means that we should tell you."

"What about 'the moment to lie' that comes right after that?" Ron asked skeptically.

Nico shrugged. "Prophecies are confusing. It'll make sense eventually."

"So…you three really have gods for parents?" Ron asked.

"Well, one parent." Thalia amended. Hermione looked as if she were trying very hard not to protest.

"Who are your parents then?" Harry asked. It was still hard for him to believe, but he was curious.

"My dad is Hades, god of the Underworld, Percy's dad is Poseidon, god of the ocean and earthquakes, and Thalia's dad is Zeus, lord of the skies." Nico supplied.

Ron snorted. "You're dad is the god of the skies and you're scared of heights? That's ironic."

Thalia glared at Ron. "Don't we have class soon or something?"

"Wait!" Harry said. "Do you have any…godly powers or anything?"

Thalia, Percy, and Nico paused. "Well…yes, I suppose you could say that." Thalia seemed reluctant to admit it.

"Can you show us?" Ron asked eagerly.

"We can't just go around using our powers all the time for your entertainment!" Thalia protested. "Besides, someone could see us–Percy what are you doing?"

Ron, Harry, and Hermione turned to look at Percy. He had grabbed a glass of water from the table.

"Chill, Thalia. I'm not going to do anything crazy. Watch this." Percy splashed the water onto himself. Rather than being soaked, the water almost seemed to disappear.

"You're water-proof?!" Ron exclaimed. "How do you take a bath?"

"I'm not always waterproof," Percy explained. "I can turn it off."

Ron turned to Nico and Thalia. "What can you two do?"

"I can summon lightning," Thalia said.

"I can temporarily raise the dead and shadow-travel." Nico said.

"You mean you used to be able to raise the dead and shadow travel." Percy interrupted. "Now you can occasionally shadow-travel."

"What's shadow-travel?" Harry asked. "And why can't you do it that often?"

"He overexerted himself not that long ago," Thalia explained. "Now he can only do it occasionally or he risks turning into a shadow."

"Shadow-travel is kinda like apparating," Nico explained. "But I have to have shadows and it makes me really tired."

Harry nodded, processing this new information. He now knew more about the three Americans than he ever thought he would, but he didn't know how to handle the information. First he had been introduced to the whole wizarding world, and now he had to adjust to the revelation that there was whole other world out there; a world of gods and monsters and legends.

"Ok, we actually do have class now." Thalia said.

"What?!" Percy exclaimed. "But that means no breakfast!"

"Sorry." Thalia did not sound very sorry. "Let's go, we're going to be late."

~o~O~o~

Harry found himself observing the three 'demigods' for the rest of the day. They went through their classes the same as always, but now he looked at them with a new light. The way they struggled to read notes on the backboard made sense now. When they rolled their eyes over Trelawney's ridiculous predictions, he knew that it wasn't just because she sounded crazy. When the muttered to each other in Greek, he knew why.

He didn't know everything about them, but he knew enough that it was like looking at them with new eyes. He wished that the same were true about Professor Elric. The letters that they had snatched had only raised more questions. Naturally, that was what was on Harry's mind during alchemy class.

Alchemy class was…interesting. Harry had thought that nothing could top the Spear Incident, but he was wrong. The class was significantly smaller than it had been one month ago. There were now ten students remaining. Professor Elric turned to face the class.

"There are ten students in this class now. Some of you will most likely either quit or be kicked out by the end of the year." He informed them.

Hermione's had shot into the air. "But professor, we all answered the riddle correctly, so why would be kicked out?"

"If any of you decides that you're too good for the rules, then I'm not going to teach you. Alchemy is dangerous. If I find out that you're planning to use it for something that could harm you or anyone else, then you're out." Professor Elric's tone was deadly serious.

Hermione raised her hand again, hesitantly this time. "Professor, what kind of dangers do you mean?"

The young professor's mouth was set in a grim line. "That is what this class will be about. You shouldn't continue learning alchemy unless you know all of the risks."

The class shifted uncomfortably as he continued. "Alchemy is a complicated science. Some of you may quit simply because you aren't smart enough. In fact, I except that my number of students will be cut in half by the end of the year. Because alchemy is so hard to preform, it's easy to make mistakes. Mistakes can cause rebounds, which can be harmful."

Professor Elric continued for the rest of the class talking about different types of rebounds and their levels of severity. By the end of the class, everyone was even more nervous than before; even the two Slytherins, Malfoy and Zabini.

"Alright, we're done." Professor Elric ended class abruptly, as he always did. But this time, he wasn't quite finished. "You six." He pointed to Harry and his friends. "Stay here. The rest of you, leave."

The four students shuffled out of the classroom, Neville shooting them a worried look on the way out. When they were gone, Professor Elric turned to the six students with a fierce glare in place.

"Now, I want to know what exactly you think you were doing in my room."

A/N-So…I wasn't sure about this chapter. I didn't really want to reveal the demigods yet, but it was kinda necessary for the plot. I just thought it seemed so cliché. I definitely wouldn't have done it if it wasn't necessary. In case you weren't sure, the demigods did not reveal that they are from the future. And I want you all to know, I tried to put fluff in this chapter. I really did. It didn't work. I don't know why fluff is so hard for me to write. I just thought I'd let you guys know that I tried. But I will eventually get fluff in this story even if it kills me.