Nico and the Einherji(Magnus Chase/HoO)

'I'm sorry it had to be this way guys, but move on, don't forget, but move on.'
Those were the last words that came out of the hero who defeated Gaea.
No he wasn't the greatest hero of the century, or the 'cool' guy.
But he was a hero.
Doesn't every hero have a happy ending?
Not true.
Now despite the fact peace has been restored, darkness looms over us.
He needs to return, for the sake of the world.
Now you may be wondering, who is this 'hero'?
Not Percy Jackson
Nor Jason Grace
Not even Leo Valdez.
Keep guessing.
Frank? Nah.
How about Annabeth? Not her either.
Piper? Helping Leo.
Hazel? Too innocent.
Reyna? She's fine.
Maybe you have already decided who it is maybe not.
Here's your answer:
Nico Di Angelo, son of Hades, Ghost King.
(WARNING SLOW UPDATES!!!!)