This is about all the Greek myths and monsters. Gods and goddesses too. Everything you want or need to know about every god and goddess or every mythical story is in this.
Whatever it is, he's seen it all. From son to warrior, to lover, and the following fall, he's experienced it all. It doesn't get much worse than the Void. Maybe a particular Titaness can band together with two guilty goddesses to save Percy. [Percy/Calypso/Artemis/Athena]