The Pact

After the war against Gaea, all the seven besides Percy end up dying. To protect the camp from himself and his insane mood changes, Percy heads to space. He meets up with an old friend and enemy, and together they hide from Chaos, dodging the responsibility of being one of their high commanders.

Using new masks with abilities and fighting his out of control seasonal mood changes, the Hero of Olympus attempts to save it once again after a five-year absence.

Disclaimer: I don't own Percy Jackson; Rick Riordian owns it.