[DISCONTINUED] The quest on the Argo II has ended, Gaea has been defeated and everyone is at peace... Or are they? A few months later Leo disappears without a trace. Soon, everyone but Percy has mysteriously vanished. No one knows where they have gone. Meanwhile, underground, monsters find strange people in odd places. They aren't monsters either. NOTE IMPORTANT: Percy Jackson belongs to Rick Riordan and Undertale belongs to Toby Fox, I am not claiming any of the rights to these. Please check out the announcement at the end of the book.