Inner-Earth

When what was supposed to be a simple exploratory journey sweeps Our Heroes down an underground river, they discover a new world in a gigantic cavern far beneath the surface: Inner-Earth. Inhabited by creatures that long ago died out on the surface, ancient lost peoples and tribes that somehow found their way down there, insidious serpent-men, and a group of lost Nazi explorers whose intentions for the place are decidedly more sinister than the heroes', Inner-Earth contains wonders marvelous to behold . . . and perils deadlier than anything in the sunlit lands. Do the heroes have what it takes to survive the perils of a hollow world? Inner-Earth includes: a description of the three main caverns of Inner-Earth and how this strange world at the center of the Earth functions, including four maps of the major areas of Inner-Earth descriptions of the four main races inhabiting the place (Aztecs, serpent-men, Mongols, and Neanderthals) character briefs for about a dozen NPCs, including "generic warriors" of all four races one character sheet and four character briefs for the Nazi expedition that's already stuck down there and scheming for ways to get out GMing information and tips, including a GM's Vault of secret, GM's-eyes-only information character sheets for seven more dinosaurs to accompany the ones already described in The HERO System Bestiary Written by Steven S. Long