Disclaimer!

These characters do not belong to me nor do I make any money off this story. I am merely writing Fan Fiction. The characters belong to their respective authors J.K Rowling and Rick Riordan.

*Note: I know that Harry Potter and Percy Jackson do not exist in the same timeline, but in this fanfiction let's pretend they do. This is after the war with Gaea as well as the Battle of Hogwarts.

Thank you to those who read, liked, reviewed, followed or more! I appreciate it!

I hope you enjoy Joining Forces. Constructive criticism is welcomed, please pardon some of my writing. I am new at this.

Annabeth POV:

Potions was the last class of the day, and the one which I was able to see Percy, but not Nico. I arrived at the dungeons a little earlier than others, hopefully, if he shows up we could talk without anyone else interrupting us. Witches and wizards were so nosy. "Wise girl!" I heard a familiar voice cry. I ran to the door where Percy had just entered, a bag in his hand. He let it drop to the floor as we embraced each other. "Seaweed brain," I said smiling, even now he still smelled of the ocean.

"I've been waiting here for a good few minutes. We need to get to classes we know we have with one another earlier so we can chat," I lowered my voice remembering the teacher at his desk. "Without interruptions," Percy nodded and grabbed his bag, placing it near mine taking the seat next to me at the back of the class. "Annabeth, do you know what Horcruxes are?"

"No, what are they?"

"I don't know. I ran into Harry, Hermione, and Ron when I was heading to this class. They were talking about something called Death Eaters and Horcruxes. I asked them what a Horcrux was,"

"Did you ask about the death eater thing?"

"No, just asking about Horcruxes made them go all flustered and saying stuff like umm, what, pardon, I'm not sure, did you like the food at the feast? I was considering staying with them, but I figured they wouldn't spill anything when I was around so I came here quicker,"

"Strange. I think we'll have to keep an eye on them, or maybe since you're part of their house you can get them to cough out some information without blowing our cover. Let's relay this information to Nico when we get the chance." Percy nodded, and quickly switched the topic, noticing more students entering. "So your first class was Transfiguration? How was that?"

Percy POV:

"Nico!" I whispered as we burned our sacrifices. "Try finding out what a Horcrux or a death eater is," He nodded curtly and went to the Slytherin table sitting next to Draco. I sat down back on the Gryffindor table. "Hey Percy, how come Nico has a skull ring?" Harry asked.

"Oh, that. He likes it. What's a death eater?"

"You're asking what a Death Eater is?" Neville Longbottom asked.

"Yeah, Harry, Ron, and Hermione were talking about it. I'm curious,"

"Harry, Ron, Hermione, are you still thinking about you-know-who? Try relaxing, it's all finally over now,"

"We-"

"If you want to know I'm sure we can tell you," Neville continued, "Didn't you have death eaters back in America?"

"Well, not that I know of. We had a different problem back in America,"

"Another dark wizard! What was their name?"

"Um, Dirt Face,"

"Why was she called Dirt Face?" Hermione asked.

"Why was he called Voldemort?" I retorted. Neville turned to the trio. Rather than answer, Hermione began explaining Death Eaters. "Death Eaters are the wizards which supported Voldemort. There still might be some around. After Voldemort's first fall, there were still some Death Eaters loyal to him,"

"Are there any more Death Eaters left?"

Ron eyed me as he answered, "Not that we know of,"

"Hi, Harry!" A blond-haired boy said entering the common room a camera clutched in his hand. There was a collection of gasps coming from other Gryffindor students.

"Colin Creevy?" Harry said.

"You remember me!"

"O-Of course," Harry stammered, flabbergasted, "however, not to be rude, but aren't you supposed to be dead?" Another person back from the dead? I'd have to tell Annabeth and Nico, with three people back maybe Hades wasn't doing such a good job anymore. Colin didn't seem like some sort of zombie though, he was perfectly fine just like Dumbledore and Snape. In fact, he was acting as if nothing had happened, jumping up and down giddily in front of Harry.

"Yeah. Funny enough I just opened my eyes to find myself not dead! Isn't that great!?"

"Hi Colin," I said, "I'm Percy Jackson, a new student. Can you explain what's going on?"

"Hi Percy, I'm Colin. I was killed by Death Eaters, but now I'm alive! It took me a little while to manage to get up, but then Dumbledore came and got me back enrolled at Hogwarts at Gryffindor. Can you believe it? Dumbledore's alive! I'm so happy!"

"Colin, how are you bloody alive?!" Ron asked, shaking the Gryffindor by the shoulders. Colin couldn't respond once Ron finally let him go. He fell to the floor clutching his sides as if immense pain was flooding through his body. "Colin? Colin, are you okay?" After a few moments of repressed whimpering, Colin hopped right up on his feet. "Yeah! It's just my body still isn't functioning too well. I'm still fresh from death, I'll be fine."

"I had a feeling you'd be out of the common room," Dumbledore said after I stopped him in the hallway, I had told the other Gryffindors I was going to the restroom, but I was just trying to find Dumbledore. "Is there some way you could make it that my friends and I can meet without others knowing?"

Dumbledore stroked his long, white beard, "I'll do my best. As you probably know I do have several questions and duties I must attend to, it is difficult to manage everything," His voice lowered to a whisper, "that is why I got Chiron to send you,"

"Headmaster!" A man ran up to Dumbledore. His hair was thin and grey leaving a bald spot on the top of his head as the rest fell past his shoulders on the sides. He looked at me and frowned, "What are you doing!? Students-"

"Argus," Dumbledore addressed, directing the caretaker's attention away from me, "What is it you want to tell me?"

"She's alive!" He cried waving his hands in the air, "On the school grounds, now!" Dumbledore's eyes widened.