There is no HoO. This takes place in the beginning of the order of the Phoenix, and after the war with Kronos.

Percy

There were two boys. One was particularly skinny and pretty wimpy, while the other was big, and by big I mean fat. They were running in fear in the pouring rain, both soaking wet. They ran into a tunnel and from the looks of it, they were cold. They were both letting out big breaths, and you could clearly see it. Then, two dark shadowing creatures that looked like they belonged in the underworld flew in from one end of the tunnel.
The skinny boy yelled. "Run Dudley! Run!"
Before 'Dudley' could do anything, one of the ghostly figures flew over to him and started sucking in by his face. Honestly, it didn't look pretty. The other one had the skinny by held up against a wall, doing the same. Don't get me wrong, I didn't know these people. But I wanted to help SO badly. The skinny boy fell out of the monster's grasp and backed up so he could grab a stick. Wait, a stick?
He pointed it at the figure. "EXPECTO PARTOLUM!"
Smooth, bright light came out of the boy's want, and the creature didn't like it. It backed away, farther and farther as the light got closer and brighter. It eventually flew out. The boy pointed the stick towards the creature over Dudley and that one went away as well. Dudley was unconscious, and the other boy was wide eyed and out of breath.
I felt someone shake me and I escaped dream land.
With and inhaling gasp I woke up. It was Annabeth.
"Percy!" She said, a little scared.
"What? And why are you in my-"
"Nico! Nico's missing!"

Okay, so how was this as the chapter one rewrite? By the way, I'm going to need some demigod OC's. Here's what I need:

Full Name:
Nickname:
Godly Parent:
Mortal Parent:
Personality Traits:
Choice of weapon:
Appearance:
An item he/she always has(optional):
Crush:
What house he/she would be in:
Other:

WARNING: I am only choosing a few, so don't expect all of the OC's to be in this story.