Since this is an AU for the PJO series, I'm gonna change up some of their ages, but first, a few things:

None of them know their mortal parents seeing as they grew up on Olympus

Hazel never died

She never went to the Fields of Asphodel

Nico and Bianca were never put in the Lotus Hotel

Thalia was never turned into a tree

Thalia isn't a Hunter of Artemis

I'm pretty sure Thalia is supposed to be 7 years older than Jason but I don't want to make her 23 while everyone else is in their teens so I will be changing that

Jason and Hazel are not children of Rome and were born from the gods' greek counterparts

They all know Diana and think of her as a big sister.

Percy - 17

Thalia - 19

Jason - 16

Nico - 14

Bianca - 16

Hazel - 14

Prologue

"Are you certain that information you obtained is correct?"

"Do you doubt me?"

"Shouldn't we all? You've been bested by children before, let alone the League."

"You'll regret that. Teekyl!"

"Groooooowl….."

Voices rang out in every direction and arguing soon ensued.

"Enough! It doesn't matter if his information is trustworthy. My own reconnaissance has proved successful. They are here. It is certain."

Maniacal laughing reverberated but was cut off as a loud voice broke through the chatter.

"We finally will have our hands on a weapon to use against that insufferable League. The power of the gods! Deathstroke, Klarion, go bring us our new friends."

Elsewhere, a little while later

"Thalia! Wait up please!" Hazel cried out as she held onto her brother and sister for dear life. Thalia proposed the great idea to leave Mount Olympus and go play in the mortal realm. No one really opposed so as she marched happily down the streets of Manhattan, Percy and Jason trudged along behind her, while Hazel gripped the arms of her siblings. Hazel had never left her home before, let alone seen pictures of the mortal world, so it was clear to all that she was frightened.

"Come on Hazel, you'll be just fine." Percy said as he gently took Hazel's hand and Jason took the other.

"Perce is right," Bianca started, and Hazel turned to see her big sister smiling sweetly at her, "Me and Nico, are right here. And us and Thalia and Jason and Percy aren't going to let anything happen to you."

"Okay.." Hazel sniffed.

"Well now that that's over, let's-" Thalia was cut off by a dagger whizzing passed her cheek and drawing a little blood. Immediately, everyone got into a fighting stance and prepared themselves for battle. Thank god for the mist. If these were monsters, they wouldn't want the mortals to witness it.

The teens watched as a man in orange and black armor walked around a corner with a weird looking man holding a cat standing next to him.

"Oh this should be fun~" The weird man giggled out.

"This is not a game, Klarion. Get to work." The other man growled. Percy and Jason stepped next to Thalia while Bianca positioned herself in front of Hazel and Nico.

"You're no fun, Deathstroke." Klarion pouted.

"Bianca I can help, please let me!" Nico pleaded.

"No, Nico. This isn't the time to be selfish." She replied and a stygian sword materialized in her hand. Percy called upon the water while Jason and Thalia called upon the wind and lightning respectively.

"I've never played with demigods before~" The weird man, Klarion, said. The demigods in question bristled.

Percy and Jason attacked Deathstroke while Thalia went after Klarion. Percy and Jason fought as hard as they could, but the man in the armor was too strong. They never knew mortals were that strong. They were knocked aside after taking heavy damage. Jason landed on Percy and there was a sickening crack that could only be Percy's ribs breaking under Jason weight. Try as he could, Jason couldn't move off Percy to asses his older cousins wounds because he himself was too wounded. The man in armor had broken Jason's left leg and right arm. His head was pounding and he succumbed to the darkness. Thalia was momentarily caught off guard by looking at her brother slam into Percy and didn't notice the gust of magic coming towards her until it hit her.

"Thalia! Jason! Percy!" Bianca cried out. She knew she had to do something but she also knew she couldn't leave her younger siblings unprotected. Nevertheless, she raised her sword and charged at Klarion.

"Teekyl, attack!" Klarion shouted, and his cat grew to an enormous size and lunged at Bianca. Teekyl sank its fangs into Bianca's neck.

"BIANCA!" Nico and Hazel screamed in unison. They tried to run to her side but Hazel was swept up by the man Percy and Jason were fighting and Nico was knocked to the side.

"..Bi-Bianca.." Thalia said just before she passed out.

"You imbecile! You weren't supposed to kill them!"

"She came at me, it was reflex." Klarion reasoned with the fuming assassin.

"Nevermind that, we'll take the girls for now." Deathstroke said as he picked up Thalia and slug Hazel over his shoulders.

"Nico! Nico, help! Nico!" Hazel screamed for her brother as they disappeared into a portal. Nico ran towards her but was too late as the portal closed in on itself. Nico ran to Jason and Percy's side and tried to shake them awake and then to his sister's. He placed his ear over her heart and started to cry when he didn't hear it beating. He sat in the middle of the rubble until he heard footsteps approaching. Thinking it was those men, coming back for him and the others, he picked up Bianca's sword and stood ready to attack.

"Lower your weapon Nico, I was sent by your father and uncles." A smooth and gentle voice called out to him. Nico's sword fell out of his hand at the sight of someone very familiar to him.

"Diana." He said, exhausted. He ran over to her and wrapped his arms around her waist and she returned his embrace while looking over to the damage that had been done. She looked on sadly and when her eyes fell upon Bianca's slain form, she prayed that her soul would find peace in Elysium. Diana reached a hand up to her ear and and pressed her comm.

"Wonder Woman to League, Batman come in."

"Batman here, what is it Diana?"

"I need immediate transport for four people and me. Prep the med bay as well, and Bruce...two are in critical condition and one is dead." Diana was met with silence as a light appeared and she and the young demigods disappeared.

What do you think? I'm so mean, I killed Bianca off. This is kinda long for a prologue but I wanted to write the first chapter differently so I wanted to get this beginning part out of the way :)

-Kitsune