Pech

Their isolationist villages are hidden deep within the earth–all earth, as it turns out, since their tunnels through the Plane of Earth can take them almost anywhere–in alcoves hidden from the larger races as well as they can… Because, ironically, they’re very, very frequently the target of slaving efforts by the drow, the derro (which they’re actually distantly related to), and even the dwarves, along with more or less any other creature in the Darklands that sees the value of the tiny creatures.