User blog comment:SayuriDarling/The House of Hades Official Discussion/@comment-24051581-20131015185128

Did someone notice that out of the seven of the prophecy, Percy is the only one who has not had any contact with his godly parent in the HoO?? All the other gods appeared in some form or the other, some more than once....

Wonder what happened to Poseidon/Neptune??

Also I know Jupiter didn't appear in HoO but he sent that lightening Bolt to kill Enceladus I think.