My brain is always full of ideas so this one came to mind...
What if During Colledge, right after Jason's death, Percy's PTSD kicks in. He gets severe anxiety and gets into fights, nearly killing several people. He is going to be kicked out but is saved by the new counselor... a woman.
Going to therapy over the course of weeks, the woman uses magic to swiftly open Percy's mind up to seeing the source of his struggles. With the Gods being the main reason, and she manipulates him to tap into the dormant Luke level hate inside of him. Tired of suffering and loosing due the gods and their evils, something in Percy's heart breaks.
She slowly turns him into a warrior against the gods, then reveals herself as Pandora, the first Mother. She explains that she did this on purpose, to save humans ( her legacies) from the gods. She spends months teaching him magic and other things until he is ready to help her against the gods.
She gives the last spark of her husband's immortality to him, and he sets out to punish the gods for their action and inaction. As she was only immortal through her marriage, she too fades into Chaos.
His first stop is Luke's mother, to extract the piece of the Oracle from her. It kills Luke's mom but her spirit ends up sticking around and helping him, to avenge her son and those mothers and fathers that have suffered like her...
They move to the Sea of Monsters to prepare, stealing Magic scrolls and knowledge from what remains of Circe's island and they take over the Sea of Monsters.
Slowly, bit by bit they lead a revolution against the gods, all of them, to save the world and all those within from the evils of the gods and get the vengeance of all those that have suffered.
With his new knowledge and skill Percy creates a fatal weapon, one formed from the curses of all of those that have suffered from the gods, the arai that built up over the eons, creating a weapon that can actually hurt the gods.
Thoughts?
