User blog comment:Loreofwings/The Seven/@comment-186.220.40.127-20120603003427

There are very strong reference of Annabeth being the last of seven( jason, piper, leo, percy frank and hazel are almost confirmed). Hera/Juno mentioned that she will have a difficult work at rome( one of the targets of the 7 mission), Her mother ask her to avenge her at rome & there's that ella's prophecy