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 NOT ABANDONED JUST WAIT

No war comes without casualties. Out of everyone, Tony Stark knows this best of all. He'd planned for it. He'd prepared himself. He knew that not everyone was going to come back home. At least, not breathing, anyway. But this was the one outcome he hadn't planned for.