U ought to get 2 out of three

"The Mark of Athena" is the upcoming title of this  particular book series,Y.The series consists of 7 protagonists each of them sons of Greek and Roman god.The list of protagonists include X who is the protagonist of yet another famous series by the same author.

Give me any of the two form the following list :- Y,X,Author

Answer
Y-Heroes of Olympus
X-Percy Jacson
Author-Rick Riordan
Cacked by2 out of three)-Nandu,Srihari,Rishwin,Abhinav,Muhamad,Hari,Anurag,Aravind Senan,Mathew,Vishnu,