Deep underground, there’s a vast network of caverns and tunnels, leading anywhere and everywhere throughout Nornfeld The many realms of Nornfeld, or the known lands. . It is believed to be alive, shifting and changing without pattern. Creatures from the surface who accidentally find an entrance are rarely seen again. It is said that the caverns play tricks on your mind, beguiling you with illusions of your worst fears and deepest desires. This network is commonly referred to as Rock Hollow, the Hollow, or simply, the caverns.
Subterranean creatures, as well as devotees of the Thing The thing is a mythical aberration that doesn’t speak any language, and it is believed to be itself Rock Hollow. , can navigate through the caverns under the Thing’s blessing.
Its inhabitants include colonies of drow elves, kobolds, and other creatures of the Underdark and they speak Undercommon.