Dwarves

Dwarves live in two separate groups, ocean and mountain.  The mountain dwarves retreated to their mines when humans arrived, and sealed the entrances.  They’ve been expanding their network of tunnels ever since.

Extended families all live in subterranean tunnels, with apartment like homes built to either side.

it is customary on a couples wedding day for the family to help them dig their own apartment.  

Bachelors either live with their family, or more commonly join in the miners, Smithers, or mages guilds to gain experience in the craft.  Each guild has a living area that feels like a small city.

Because of the evacuation from the Humans, there are abandoned dwarven cities on the surface.  Most of these cities are now inhabited by humans, but one of the more remote cities in the mountains is populated by Autognomes

The Dwarves that evacuated underground have been evolving to have much more sensitivity to light, and are getting shorter with each generation.  The Stone Flotilla Dwarves have grown resistance to the damaging effects of the sun.  The ones that evacuated to an underwater city have begun evolving into merfolk.