A/N: The Titan War is over, and Nico is sent undercover to Hogwarts to help out with the Wizarding War. It's Harry's fifth year at Hogwarts (The Order of the Peonix) and Nico and Harry are both fifteen. Hermione/Ron, Harry/Ginny, and Nico is single.
Disclaimer: I don't own Percy Jackson and the Olympians or Harry Potter. Their respective owners are Rick Riorden and J. K. Rowling.
"Talking" - talking in English
Thinking - thinking
"Talking" - talking in Ancient Greek
Third Peron POV
"Nico, I have a quest for you."
Nico looked up from the midnight black sword he was polishing. "Yes, Dad?"
The Lord of the Underworld sighed. "It seems that long ago Hectate blessed a group of ordinary humans with the gift of magic. No, they are not Hectatae's children. She thought that mortals should have, as she called it, 'their time to shine.' The problem is, there is a Dark Wizard named Tom Marvolo Riddle, though he goes by Lord Voldemort. Tom has found a way to cheat death."
"Cheat death? Evade you and Thatnos? Impossible!" Nico interrupted.
Hades replied, "Difficult, but not impossible. Have you ever heard of a Horcrux?"
Nico thought a minute before replying, "No. What is it?"
Hades answered his favorite son, "A Horcrux is what a wizard calls a split piece of soul. To create one, you must do terrible things. When someone has made a Horcrux, they cannot die. They just find where ever they hid their Horcrux and use it to create a new body."
Nico made a face. "That's disgusting. So this Tom you've been telling me about made a Horcrux?"
"He didn't make a Horcrux. He made seven Horcruxes." Nico's eyes widened. Hades continued, "Only the one named Harry Potter can kill Tom, but Tom will just keep evading death unless his Horcruxes are destroyed. That's where you come in. I want you to pose as a Hogwarts - " Nico snorted at the name " - student and keep Harry safe while looking for and destroying Horcruxes. You're the only one that can find them without having to do a lot of research. I'm counting on you to complete this task, Nico."
Nico nodded. "I just have a few questions, Dad." Hades nodded. "How do I pose as a student if a can't do magic?"
Hades replied, "Hectate had agreed to grant you the gift of magic temperarily. Since you will be starting in your sixth year, she put the knowledge of the spells the other students have learned in your head."
Satisfied, Nico moved onto his next question. "How will I get my things needed for school?"
"I have provided you with everything you need. It's all in this trunk." Hades waved his hand and a raven black trunk appeared.
"Will my teachers know of my being a demigod?" Nico continued.
"None of your teachers will know, and niether will your Headmaster. None of the students should be informed of your secret, either. Also, you should hide your weapons, as they would be confiscated at the school."
Nico nodded. "Last question, how will I get to Hogwarts?"
"You will shadow travel to King's Cross station in London, England by no later than eleven o' clock, their time on September first. When you get there walk into the wall between stations nine and ten. Don't shadow travel. Just walk into it, and you will arive at Platform Nine and Three Quarters. Then hand the conductor your ticket and board the train."
It sounded simple enough, but walking through a wall was a bit wierd.
"I understand, Dad. I'll do my best."
"I'm counting, on you Nico," said the Lord of the Dead. "Oh, and one more thing. I understand that there are an abundace of ghosts at Hogwarts. I have allowed them to stay there for the time being, so don't send them down here."
Nico nodded, though hesitantly. He didn't like ghosts that just stuck around. They should just except the fact that they were dead and move on.
Hades smiled, a sight only Nico had ever really seen. "Good luck, Nico."
Nico nodded, then went back to polishing his midnight sword.