From the back cover: Hidden in the underground depths are the Subterrans, a savage race of hideous humanoids. They travel through their tunnels, digging ever closer to the surface. And they are hungry...hungry for human flesh!
The cover is a homage to Fantastic Four #1.
see: goodcomics.comicbookresources.com/wp-content/uploads/2008/05/kirbyff.jpg
Rob Bell tells us a lot about Fantasy Hero and the Fantasy Hero Companion.