Disclaimer: I do not own Percy Jackson and the Olympians, Heroes of Olympus, or Harry Potter. All rights go to their respective owners. The only thing I own is my original plot.

To clear up some background information, everything from PJO and HoO has happened, the only difference being the time and setting. In this AU, Percy and co. completed these prophecies in ancient Greece and Rome, respectively. Also, the characters I have cut out are Annabeth, Hazel, and Frank, and maybe Piper and Leo. Annabeth because I don't want Percy to have a pre-developed love interest, and the others because they don't fit well into my story. It is possible for any of the others to appear later in the story.

Chapter 2

-Roughly 500 years after the fall of Rome, 17 years before the founding of Hogwarts.-

Perseus POV

It has been about five hundred years since Rome fell, since I last spoke with Hecate. After I arrived on Olympus, Artemis promptly greeted me and took me to the Hunt. Now that, was a painful experience. I had expected a frosty reception, not a volley of silver arrows. Still, Thalia was there, and with time, Artemis eventually told her huntresses to warm up to me. I had finally found out what Lady Hecate meant by my "animagus ability." After 6 painful months since my induction into the hunt, I could focus my magic to transform into a jet black wolf, with a sea green trident on my right paw. Lupa would be so proud… It had definitely helped with my participation in the hunt. Plus, I understood that many of the girls here were not comfortable with a male in presence, so I spent almost half of my time as a wolf, much to Artemis's appreciation.

As the years progressed, the knowledge Lady Hecate had blessed me with started to unravel. I never thought I could appreciate a stick, er, wand, as a weapon. The sheer variety of spells I could cast astounded me. I remember the first time I had showed Thalia though, she couldn't stop laughing for a week. I changed her mind however, when I learned the supposedly "unforgiveable curses," as they were dubbed by the wizards.

First of all, let me tell you, the Cruciatus curse is no joke. It really does feel like a thousand white hot knives lighting up your nervous system like a Christmas tree. The Imperious curse is just as dangerous, after using it once on Thalia, (I needed someone to practice with) I decided I wouldn't ever use that one again, at least not on anyone I trust. Now, the Killing curse, funnily enough was the most hilarious one. When I first cast this, it was an accident. Let's just say I was particularly mad at Thalia for a particularly painful prank, and I casted without thinking. One flash of green light later, I see Thanatos standing there, in all his buff glory, with a really confused look on his face. He then face palmed and grumbled something like "stupid magic goddess inventing a curse that calls me every damn time its cast." He then went on to explain how our souls were immortal, and apparently they weren't so easily taken out of our bodies. Well. The more you know.

Anyway, I was just about to retire to my tent in the hunter camp when I heard a voice in my head. "My champion, it is time. The four greatest wizards of this age have met, and are discussing plans for a school. Your presence will be needed Perseus." I immediately set out to find Artemis. After running all over camp, I found her in her Thalia's tent giving her directions or something. As she turned to look at the intrusion, I brought my fist to my shoulder and bowed, "Lady Artemis, my patron has finally called me. It is time for me to carry out her quest." She blinked twice, before realization dawned on her face. "Very well Perseus. Come, I shall inform the hunt you are leaving."

As I was about to follow her out, Thalia tackled me into a hug with tears in her eyes. "Dammit kelp head. Do you really have to go?" A bit choked up, I replied "I'm sorry Thalia, but I made a promise to Lady Hecate. This is something I need to do." After our moment, I walked outside to find Artemis and the rest of the hunt waiting. Saying goodbye hurt a lot more than I thought it would. After half a century with them, I realized these girls were my family; the sisters that I never had. After one last goodbye with Thalia, Artemis walked up to me and stared at me for about ten seconds, before hugging me as well and whispering in my ear, "I wish you luck Perseus. Don't get yourself killed, please." I blushed slightly, and told her "I won't my lady. Thank you, for giving a home here with the hunt. It was more than I could have ever asked for." She nodded and we separated. I gave everyone one last farewell, before I gathered my things, and apparated away.

After a good while, I had finally located the founders. It took me a while to get my bearings, when I realized I was in a castle. A huge one at that. I reached out with my senses, and found four beings inside the central area. I quickly made my way there, and was about to walk in through the massive doors when I stopped.

"Damn it Percy, do you have any idea what you're doing?" I thought to myself. Obviously, I couldn't just simply walk in and say "Hi, my name is Perseus and I am an immortal half god that is assigned to guard your school for the next millennia." I quickly thought of a plan. Centuries of training with Artemis has turned me into a certified ninja. I quickly found a way in through the top part of the wall. As I crept into the room, I found my jaw on the floor. This room was massive. Not Olympus massive, but still, for mortals, this was pretty damn big. I looked up and almost fell off my perch. There was no damn roof. I think…Upon closer inspection I realized this was done by enchantments.

Moving on, I slowly made my way across the many ledges on the walls to the four people at the far end of the room. As I neared the four, I debated on the best way of doing this when I decided to just wing it. Oh well. I then tried out a neat trick my father had once taught me, and turned my physical body into vapor and slowly reassembled myself in front of them. I was about half way through before the one of them, noticed me and quickly stood up and pulled out his wand. "Salazar what on earth are you doing!?" one them yelled. Wordlessly, he gestured to me. Next thing I know, all four have their wands drawn out at me. After I completed myself, I looked at each of them. I almost died from laughter. Their clothes, I can't even describe them. They all had a robe with a color scheme, red, green, black and yellow. Then again I looked at my own clothes. I was still wearing my hunter's uniform, with its silver camouflage design. I probably looked just as ridiculous to them.

I slowly raised my hands up and told them "I come in peace." Then with a flick of my hand I promptly disarmed all four of them. They all inhaled sharply and looked at each other before turning their gaze to me. "Who are you?" the one in the red asked. "That is a difficult question wizard. A very difficult question." I took a deep breath before speaking again, "my name is Perseus. I am a wizard from lands east of here, and have come to offer my services to you." The one in the green gave me a questioning look, before finally saying "I have never heard of you before, yet by the looks of things you may be very powerful wizard." I glanced at him before calmly stating "I have not made myself known to the world for many reasons. None of which you need to know. However, I meant it when I said I come in peace."

I then handed their wands back to them. "May I please know your names?" The woman in the yellow gave me a surprised look before saying "you do not know who we are?" With a sheepish look, I told her "no, I'm afraid I do not miss…?" "Hufflepuff. Helga Hufflepuff. This here is Rowena Ravenclaw, the man over there is Godric Gryffindor, and that snake right there is Salazar Slytherin." I took a minute to not laugh at their names, before launching into a faux explanation as to how I "heard about their school" and how I wanted to "supervise" for them.

After another 2 hours of constant questioning they had finally agreed to consider my proposition. Salazar then turned to his fellow founders and said "are we really going to let this, stranger, who we still know barely anything about, become a professor here at Hogwarts?" After another moment of me trying not to burst out laughing at the most ridiculous name for a school I have ever heard of, I quickly cut in, saying "you are mistaken, I am not asking for a teaching position here, merely, the job of overlooking the safety of this school." After a few more seconds, Godric asked me, "and if we refused?" I shrugged and told him "I would do it anyway. There is little you can do to stop me I'm afraid." At this, Gryffindor snorted, and was about to say retort before Ravenclaw interrupted him, "Godric, don't be foolish. I know this man looks young and inexperienced but he obviously ripped through our wards and disarmed us all at once when were at the ready. He is not one to be trifled with. Think about what he's asking. All he wants from us is a chance to protect this school, for nothing in return. I honestly don't know what to think of this but I have no intention to argue with him."

I sighed in relief. I really didn't want to continue this conversation. Hufflepuff piped up, "Well Godric, we were looking for employees anyway. Might as well start now." After a bit more discussion among themselves, they finally agreed with my terms, and gave me a tour of the castle. By the end of the tour, I was exhausted. I said my goodbyes and left the castle.

As I made my way to a small little village close by to the castle, I thought to myself, "I guess I really did just walk in and told them I would be guarding this castle for eternity." Huh, funny how that works out. I realize that they're going to be really confused when I don't grow older as the years go by. Ah well. I'll deal with that later. Not too long afterwards, I found an inn and fell asleep as soon as my head hit the pillow.

Well. That's chapter 2 people. Please note that next chapter, I will skip all the way to Hogwarts circa Marauder period. There will be a brief summary as to what Percy does and all that, but next chapter will start getting more into the Harry Potter era storyline. Thanks for reading, feel free to follow/review!