Deep Gnome

Deep gnomes were wiry and lean with a body as hard as a slab of rock ranging from 3​ to ​3.5 feet (0.91​ to ​1.1 meters) in height and weighing between 40​ to ​45 pounds (18​ to ​20 kilograms). Males were completely bald and beardless, while the females sported hair.Deep gnome complexions were sometimes described as "gnarled" and, like drow and duergar, were commonly dark in hue, with most deep gnomes demonstrating brown or gray skin with dark gray eyes. Females typically had gray hair.Deep gnomes were a surly and cynical people who fatalistically expected little more from life than what they had. While they treated their own kind with respect and even goodwill, trust was not easily given to anyone from outside their village, or even outside their family. They kept to themselves, were extremely cautious when contacting other races, and eyed all strangers with suspicion.

Deep gnome culture was largely defined by the environment in which they lived. Deep gnome settlements were usually centered in a single large cavern, surrounded by an interlocking set of tunnels and other caverns into which the city spread. These settlements were often large villages or small towns, with a population of around a thousand gnomes. Typically cut off from all outside contact, even from other deep gnome settlements, many inhabitants never ventured out of their havens, instead crowding together for protection. Population density was extremely high as most families shared a single, small room for their living space, with children living with their parents until they themselves married and had children.

Deep gnomes may not have always dwelt so far below the surface world. Many human cities, Calimport for example, were built on top of deserted gnome cities which were repurposed as cellars and sewers. Dolblunde, a gnome city northeast of Waterdeep was also evidence of svirfneblin dwellings near the surface before it was taken over by the dracolich Daurgothoth.

For More info: DND players handbook