Hi guys! This is my first fanfiction on Fanfiction, and it's a crossover between HOO, Kane Chronicles and HP. This mainly happens during the Order of Pheonix and after BoO and the Serpent's Shadow. I will probably constantly switch between POVs, and I apologize if any of the characters are a bit OOC.

Disclaimer:

I don't own HP, HOO or Kane chronicles. They belong to J.K. Rowling and Rick Riordan.

Chapter 1: Accepting the invitation to attend Pigpimples

Percy's POV

Great. Just great. What have we just agreed to?

Standing beside Leo was Hecate, the goddess of magic, crossroads and the Mist herself. Her eyes shimmered with amusement at the reluctance we had shown after she had told us about what she needed us for.

Not that we had any choice in the matter of whether we would go or not, of course. We only agreed because we weren't in the mood to be blasted to smithereens by the gods themselves.

Apparently, there was this world that Hecate had created a world where gods of mythology rarely intervened in mortals' business. I envy the people who had the privilege of being ignored by these 'divine' beings. Also, the mortals who lived in the world of Hecate's had the ability to wield wands, which helped them channel magic, or bend the uppermost layer of the Mist to their will.

Hecate had requested that only Leo and I go to this world of hers to help out. The reason? A war. I mean like, seriously? Another war? Can't the Fates just give us a break and go back to knitting other people's socks of death?

As if that wasn't enough-we weren't the only (half) mythological beings going either.

Sadie's POV

Hullo, Sadie here. You might be wondering why I'm recording another one of these recordings. Well, the answer isn't simple at all. In fact, it's rather complicated.

About half a year ago, my brother, Carter and I had met these people who were demigods-half-human, half Greek god. Yes, Greek mythology is all real. We can all cheer now. Yay! Whoopee! Hurray! [Don't roll your eyes, Carter. It isn't good for you. What do you mean I do it all the time?]

Recently these demigods contacted us by Iris-messaging-yes, that's a thing-and told us that they needed our help. Their goddess of magic, Hecate, had created a world of wizards and witches about several thousand years ago, but now, they're in the middle of a war, so Hecate decided that it was a good idea to send some demigods over to help. I don't think so. [cue thunder and lightning]

Then the demigods thought, Hey! It'll be a good idea to have someone experienced to help us! Oh, wait! Didn't those Egyptian magicians say they knew magic? Let's ask for their help! Yay!

So that's why we're here now, at the borders of Camp Half-blood, completely drenched in the heavy rain, waiting for Percy Jackson and Annabeth Chase to come out and let us in.

"Sadie! You're here already?" A distinct blonde figure yelled, cupping her hands to her mouth.

"About time you get here!" I grumbled. "We've been standing in the rain for so long!"

"Right, sorry. We had no idea you'd be so early." Annabeth's boyfriend, Percy, said sheepishly.

"Who's that with you?" My brother asked curiously.

I noticed that there was another person beside Percy and I peered at him, trying to get a closer look through the rain.

The boy looked like those troublemakers who manage to get a joke out of every situation. He was grinning maniacally and Carter took a step back.

"This is Leo-"

"Leo Valdez, supreme commander of the Argo ll, Mr. Mcshizzle and the boy ON FIRE!"

His hair burst into flames, which were immediately put out by the heavy rain. Carter yelped. I shook my head and gave him a silent look of disapproval. "Tsk tsk tsk...be more polite, Carter."

"Alright," Annabeth said, "so you guys will have to travel to 12 Grimmauld Place, which is the headquarters of the Order of Pheonix, the secret organization of wizards working against Voldemort. Then, you'll see the one who you'll probably need to protect-Harry Potter, he has a lightning-shaped scar on his forehead, should be easy to recognize-and attend Hogwarts or whatever school they have there. After that, await instructions via IM. That clear?"

"You said, you guys. You aren't coming." I have to say, sometimes I'm impressed by Carter's observational skills. He still needs some work on more important stuff though-for example, those awful pickup lines he always uses on Zia. [Quit glaring at me, Carter. You know it's true.]

"Unfortunately, Hecate specifically requested for these two to go." She grimaced and gestured to Percy and Leo, "I just hope that they'll be able to come back during the holidays."

"Now that's settled," Leo interrupted, "how do we plan on traveling to the awesome headquarters of the totally great secret organization?"

Carter grinned. Freak chose that specific moment to burst into the vacant space directly above us, not even tired after his trip through the Duat.

"Talk about the right timing and a dramatic entrance," Percy said. His and Leo's jaws had dropped all the way into the Underworld.

I smirked and Annabeth continued giving us information, unfazed by Freak's sudden appearance, "So you'll be traveling in the boat the griffin carries through the Duat. Don't worry, Zeus won't and can't blast you out of the sky since you're technically in the Egyptian version of a more complicated Mist."

We stepped (mostly) gracefully in the boat. "Freeeeeeeak!"

And we were off.

Harry's POV

Harry had just finished yelling at Ron and Hermione for not telling him anything, but he already felt a twinge of guilt working its way into his mind. He shook it out of his head. He deserved to know after all he had done, didn't he?

He heard a series of banging on the door to his bedroom, but he didn't open it.

"Harry, if you don't open the door this second, we'll force it open!" Ron yelled.

With a sigh, he undid the lock on the door, and Hermione and Ron charged in. There were tear stains on Hermione's robes, and Harry instantly felt guilty for yelling at his best friends when it clearly wasn't their fault.

"I'm sorry-" Harry started.

"It's fine, mate. Save the apologies for later. Dumbledore just called a meeting, and all of us are allowed to go." Ron said gruffly. Hermione stayed silent, which was most unlike her.

Harry nodded and together, the trio walked into the room where all the Order members were already waiting. Dumbledore himself was sitting at the head of the table.

"Ah, Harry, Ron, Hermione, you have arrived," The professor said in his usual calm tone, "As the unavoidable war with Voldemort-" Here, the majority of the members flinched, Harry not included, "approaches, I thought it appropriate to call in some allies from our friends in America."

Dumbledore continued, this time with a somewhat mischievous glint in his eye as if he knew something they didn't-which, Harry thought, was most likely the case-"They will be transfer students at Hogwarts, and they will be arriving and staying here until the term starts."

A collective gasp rose among the members.

"Are you sure it's safe to reveal our location to complete strangers, Albus?" Sirius asked, unconvinced.

"I have to agree with Sirius on this one, Harry. We don't even know them!" Hermione murmured under her breath.

"I assure you all that they can be trusted. But they also have their own secrets, and it would be unwise if anyone were to not respect their privacy and attempt to reveal them." Dumbledore seemed to glance meaningfully at Harry, Hermione, and Ron, "But other than that, I hope you will welcome them with open arms. After all, they will arrive tomorrow morning at the latest."