PJO Luke's army

You are Percy's twin, and you have always hated him. He has always stolen all the glory. Like the time at camp half blood, where he slew the minotaur, that was really you. He's always been taking all the credit, and you're done. At thirteen , you left camp to join Luke's army, and you've had four years to train next. You swore that next time you saw him, you will end him. and now you have your chance.