Annabeth was slipping and Percy dived to save her; something went wrong. On the surface, Annabeth leads the Seven, desperate to rescue him and unite the camps. Alone in Tartarus, Percy finds himself making harsher choices, discovering darker methods, unlocking deeper powers, tortured and fighting for his life. He swears he's still a good kid. Post MOA

Percy murders demigods in cold blood at the end of the second titan war and is banished to Tartarus for eternity. With the Prophecy of Seven coming to pass, he is released to fight in the new war. Romans and Greeks collide and everyone has one question on their minds: which side is Percy really fighting for?

It wasn't his fault but of course he got blamed anyway, that seemed the way of the gods after all. He'd been banished into the shadows, long lost to the light. But all it took was a few Demigods before he came back fighting. Maybe Zeus should have thought his plan through better.