Forever and Always - Percabeth song

Hey, who's excited for The Mark of Athena!? *random crowd people shout and wave character flags*
Where did Ты get those? Nevermind. Well, this is Blitz here, ready to help interpret the words of Phoebus Apollo's Oracle of Delphi! *Rachel Фаны cheer*
Yeah, she's amazing, yadddayadddayaddda. Okay, so this new prophecy appeared at the end of the Last Olympian, as spoken by Rachel Elizabeth Dare. She jacks Blackjack, blah blah, is the oracle, еще blah blah, and BANG! New prophecy! Well, let's hear it! :

Seven half-bloods must answer the call
To storm или огонь the world must fall
An oath to keep with...

We know nothing about her!
I want to know if people have any theories.
So, I shall ask some Без ответа questions..
..unless they have been answered already, and I've just forgotten.. xD
These Вопросы could possibly be answered in the Далее 3 books. ;)

So here are the questions:

1. Who was Reyna's father, and why was she at Circe's Island and not with him?

Bellona had two children from the same man, so maybe it's normal for Roman demigods...
I think he could've died when they were children, so Bellona sent them to Circe's Island.
...Or maybe their father had arrived at Circe's Island when Hylla and...