Add these onto the Parent Race
Ability Scores
Dex +1
Superior Darkvision
Accustomed to life underground, you have superior vision in dark and dim conditions. You can see in dim light within 120 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 gray.
Stone Camouflage
You have advantage on Dexterity (Stealth) checks to hide in rocky terrain.
Mask of the Deep
You can cast the disguise self spell once with this trait, requiring no material components, and you regain the ability to cast it this way when you finish a short or long rest. If you are in direct sunlight, enemies have advantage on rolls made to see through your disguise. Intelligence is your spellcasting ability for this spell.
Extra Language
You can speak, read, and write Undercommon.