This is a Percy Jackson/ Heroes of Olympus and Keeper of the Lost Cities crossover. All of the Seven are dead except for Percy, and Percy is super OP, because I love Powerful!Percy and slightly Dark!Percy. A year after BoO and sometime after Legacy, maybe after other books that haven't been written yet. So on with the synopsis! The war with Gaea is over, and life as a demigod is finally as peaceful as it can get. Percy is now 18, and he is living with his mother. He goes to Camp Half Blood every day to train the newer campers. On the day of a peace summit with Camp Jupiter, the camp is destroyed and Percy's parents are killed. All the demigods in America in either of the camps are dead, except for Nico, Will, a new camper named Kaylie, Reyna... and Percy. But Percy is not the same. He is darker, harsher, more angry and powerful. His fury and sorrow at almost all of his friends and families' deaths is what fuels him now. One day, as he is mourning his friends in a graveyard, he sees a clear crystal on the ground, which takes him to a strange new place... Sophie is distraught. The Neverseen took Keefe for his new ability he's manifested. They have to make a plan to get him back. When a strange boy with black hair and blue-green eyes light leaps to Havenfield, they all think he's an elf. Until they realize that he has strange powers, and he can fight with a pen. They help him realize what he is, and he helps them get Keefe back. But the final battle with the Neverseen is coming. Will this boy be a help... or a hindrance?

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]

Hecate needs help. Someone is trying to bring You Know Who back from the dead. There is only one god who can help her. And he only has one son to do his quest for him. What will happen to the Ghost King in Hogwarts? What does it have to do with The Chamber of Secrets? How will Hogwarts cope with a deadly demigod within their walls? How is Nico related to the founder Salazar Slytherin? ~COMPLETE~ Pre-HoO and written before Lost Hero was published