During the final days of the second Giant war, Percy loses the one he loves and his purpose for living. So he asks the gods for a task to challenge him and give him a new purpose. Unfortunately for him a man hating goddess and friends are going to be gaining a new Guardian. Post MOA. Pertemis

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

After two wars, everybody was tired of fighting. Percy Jackson was no exception, especially after the excursion to Tartarus that he took to save Annabeth. A year afterward, Percy is once again thrown headfirst into trouble against his will. With new strength and new resolve, Percy finds himself questioning the true nature of humanity and of his own desire to protect.

For more than a century, the two children of the gods have been kept apart. Now the greatest foes the gods have ever faced, again walk the Earth. Prophecy calls for the seven greatest heroes to defend Olympus. Now, both camps must come together to stand against their common foe. Two prophecies have begun to converge, bringing the rivals together once more. (Mark of Athena Timeline)