Explore the Frontier of the Underworld! Rotu, settlement atop the stalactite, beacon of hope for the weary and downtrodden, is a community unlike any other, a place where all Underworld races have come together to survive during desperate times. Situated at the frontier of the Underworld, the very edge of civilization, the region around Rotu is mostly unexplored and holds both wonders and horrors the likes of which no one has ever seen or encountered. Will your group survive long enough to help and perhaps settle in Rotu, or will they perish in the dark depths of the Underworld?