10. Zoë Nightshade's death
9. Nico di Angelo's reaction to Bianca's death
8. Meg McCaffery's betrayal
7. Daedalus' death
6. Ethan Nakamura's last words
5. Luke Castellan's death and sacrifice
4. Apollo's goodbye to the Arrow of Dodona
3. Bob and Damasan's possible deaths
2. "Tell the stars hello for me"
1. Jason Grace's death