Dwarf

"Ability Score Increase: Your Strength increases by 2. Your Constitution increases by 1.""Age: You mature at a similar rate as humans. On average, dwarves live up to 150 years.""Size: Dwarves usually stand between 4 and 5 feet tall. Your size is Medium.""Speed: Your base walking speed is 25 feet. Your speed is not reduced by wearing heavy armor.""Darkvision: Accustomed to life underground, you have superior vision in dark and dim conditions. You can see in dim light within 30 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of grey.""Firmly Planted: You have advantage on all Strength saving throws against someone or something trying to move you.""Stonesense: You have advantage on all Perception checks when underground or in a cave."

Dwarf Details
Dwarves are a tough and traditional folk known for their strong martial traditions, beautiful craftsmanship, and, depending on who you ask, their shrewd mercantilism.

Dwarves are a short race, but what they lack in height, they make up for in bulk.

Dwellers of the Underdark, the stoutmen are natural miners, explorers, and builders. They've constructed massive underground strongholds, both deep and into mountains; the latter usually serving as both a diplomatic and mercantile medium between the surface and deep clandoms.

Dwarves are oft considered traditional and isolationist. While this varies from person to person, clandom to clandom, it stays very true for the settlements deep below the surface. No one knows exactly how deep or wide the Underdark and its inhabitants go, but more than one scholar has suggested dwarves may outnumber all other goodly races when you take that into account.