A New Hero

It was a normal day at camp, and I was with my girlfriend Annabeth. We herd a loud BOOM. I went to see what it was, and it was a halfblood a new halfblood and he was on the ground. The halfblood was dressed in Roman armor, but he looked greek. He got up and he had an arrow stuck in his side he took it out then turn towards the borders.
There was an army of monsters out there, so everyone panicked up there gear and ran to help him. Then he put his hand in the air and lightning struck down every one of them and they turned to dust.
Everyone looked at him "Who the hell are you"? a kid from the Nemesis cabin asked. Then the halfblood turned and ran for the borders we all followed. A young girl was lying on the ground with a wound in her chest with blood everywhere. The halfblood walked towards her, and he fell to his knees crying. I thought that was his sister but she looked a lot like Aphrodite kid and he shot lightning through the sky to kill the monsters so he must have been a son of Zeus. That means she wasn't his sister, it was his girlfriend or best friend.
He rose with her in his arms "Who are you"? Annabeth asked. The halfblood said "My name is Nathan".
Annabeth asked one more question "Who is your godly parent"?
"I don't know but a woman tolled me to come here" When he said woman I thought about what he did with the lightning. All of a sudden a peacock symbol was over his head the symbol of Hera then everyone gasped.

Notes

I hope anyone who reads this enjoys it and stay for the second chapter i will explain everything in it give me suggestions please.