DISCLAIMER: All rights belong to Rick Riordan, as well as the characters.
This is just a fanfiction. If you haven´t at least read Percy Jackson and the Olympians and Heroes of Olympus, you probably won´t understand half of the story.
The story will be written focusing on different characters every so often (Heroes of Olympus style).
English is not my native language and I would like if you pointed out any mistakes in the reviews.

I appreciate any reviews and ideas.

Now, on with the story.

Chapter Two

PERCY

Shadow-travelling was…awful. The blackness spread infinitely around them; the cold sipped into their limbs; the silence overwhelmed them. As fast as they disappeared, they reappeared in a different place. They stood in front of a simple black obsidian throne. The floor was full of bones, jewels and precious metals. Screams filled the air along with a strong smell of sulphur, burnt flesh and rotting corpses. Nico smiled. Home, sweet home. Percy wasn´t as happy. The Underworld brought back bad memories: his first quest to retrieve Zeus' master bolt and prevent a war; His swim in the River Styx to gain the curse of Achilles; and, the most painful of all, Annabeth's death. All he wanted was to get her back. He would threaten Thanatos himself if that's what it took. But, if all went has he planned, she would be back.

The demigods kneeled before the man in the throne. He was pale, with a hair like Nico's. His robes were a light shade of black and from time to time, an agonizing face stretched the fabric, as if trying to escape.
-Uncle. – said Percy.
-Dad. – said Nico, at the same time.
Hades, God of Death and Riches, Lord of the Underworld, waved for them to get up.
-Nico, so good to see you again. Nephew, what brings you to my palace?
Percy swallowed in dry.
-I need a favour.
A look of understanding went through Hades' eyes.
-I'm surprised you didn't come here sooner.
-Your son was hard to convince.
-I see. – Hades stopped for a while – I know what you're going to ask for, Perseus, but I can't bring Annabeth back from the dead. It's against the Ancient Laws.

Percy expected this. The Fates wouldn't allow anyone, not even a god, to break the Ancient Laws. So, he advanced with his reasoning.
-The Ancient Laws forbid any soul to leave the Underworld because it would compromise the balance of the world. But, if you do as I ask, the number of souls will remain exactly the same.
-How so? – asked an intrigued Hades.
Nico gave Percy a look that said "Stop this while you can, please.". But Percy, being Percy, ignored him.
-Because I'm offering mine in return.

Hades seemed to consider the offer. Percy continued:
-I don't mind to spend eternity in the Fields of Punishment. I'm even willing… I'm even willing to be thrown in the deepest part of Tartarus if that's what it takes.
A sad look sprayed itself on Hades' face.
-I'm sorry, Perseus, but I can't.
-Why?! – raged Percy
-Because I made him swear on all things sacred that he wouldn't. – said a new voice coming out of nowhere.
-Who are you? – asked Percy, loudly.

A bright, white light illuminated the room and a shimmering mist appeared. It started to solidify in the shape of a woman.
-Don't you recognise me, Percy? I thought you loved me.

Percy was now crying. Of course, he recognised her. That voice, that look, that blond hair, those grey eyes…
A few feet in front of him, smiling, stood Annabeth, the love of his life.