All CJ wants to do after his first successful raid is join the rest of the goblins at a karaoke party. But according to his father, there's work to be done—a fearsome lava monster is hibernating under their village! While his friends are singing their favorite tunes, it's up to father and son to save them all! CJ wants to believe his dad, but he won't be sure until he goes underground to look for the monster himself.

Continuing the epic graphic novel series set in the world of Clash of Clans and Clash Royale, Gene Luen Yang pens an offbeat and action-packed tale that turns the fantasy-adventure genre on its head!