The duergar (sometimes known as the derro) are a race of dwarves that went deep into the earth, long ago. The duergar have little interaction with any other species, tending to be xenophobic, photophobic, and very aggressive against outsiders – including other dwarves. Their own environment tends to be rather violent, aggressive, and nasty.

They tend to have very pale to gray, ruddy skin. Their hair tends to be thick, and grayish to white in color. Their eyes tend to be very light in color, and range from light orange to light indigo.

The duergar of Gaeleth tend to be found in the Sandra Mountains of Hobrimeth, deep in the Jaeth Mountains of southern Galanath, and in every mountain range in northern Galanath.