Crashing Through The Dark

At the end of the battle with Gaea, right after Octavian shoots himself at the Earth Mother, Nico realizes his mistake.
He realizes that he just allowed Leo to be shot down. He realized he was about to get one of the seven killed.
In a desperate attempt to save him and possibly not be hated, he manages to knock Leo off of his flight path and into the ocean. But at the last moment before he crashes as well he's pulled into the shadows.
After that all he can remember is pain, he wakes up in a hospital in Gotham city with people crowding him, a billionaire trying to play hero and take care of him, and people constantly asking him questions.
Questions that should be easy to answer, right?
Except for the fact that he can't remember his own name.

*Trigger Warnings will be in the chapters, there's gonna be a lot, just be warned*

Cover isn't mine, I don't own any PJO, HOO, or DC plot or characters
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Sequel is Reaching for the Light