Percy Jackson and his fellow Olympians can never seem to catch a break can they? Well this is not any different as The Oracle of Delphi has spoken! The world is once again under the threat at the hands of a primordial. And once again the world must be saved by demigods. Oh yes and the other "mythical" creatures, we did not forget about you. Demigods and various other mythical beings from Greek and Roman mythology must navigate this new danger and prevent the destruction of the Greco-Roman Parthenon. Of course, it will not be as easy as it could be, and why should it?