Percy found out his relationship with Annabeth was false. He left camp and was almost killed, only to be saved by Artemis and was placed there by Zues. No guardian No chaos. Real Realistic story. Eventual Pertemis

500 years ago, Percy Jackson was accused of aiding Gaea in the Second Titan War. As consequence of that, he was killed to show people what happens when you betray the gods. But the gods learned that they were wrong as Chaos came after Percy's death and informed them of his innocence. But actually, Percy's alive with Chaos. War's here and a disguised Percy comes to help, who'll win?