Death's Reason

Hades had warned him that some deaths shouldn't be stopped but he hadn't listened. At the time, Nico had had too much hope, too much confidence, too many heroic thoughts. When he chose to save Leo Valdez's life, the end of the world began.

Through the help of Kronos after so undeniably earning it, Nico must go back in time to fix his mistake, to let Leo Valdez die so all of them can live.

But Kronos has his own plans and his own game, and Nico finds himself waking up to Bianca's face in the cold snow of Maine.

(or wherein Nico tries to keep Leo from dying during the final battle against Gaea and ends up fucking up the entire timeline and causes the end of the world so he has to go back in time fix it)

(lots of gore, pretty dark, this is your warning)