Duergar

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.     Dwarven Resilience: You have advantage on saving throws against poison, and you have resistance against poison damage.   Dwarven Combat Training: You have proficiency with the battleaxe, handaxe, light hammer, and warhammer.   Tool Proficiency: You gain proficiency with the artisan's tools of your choice: smith's tools, brewer's supplies, or mason's tools.   Stonecunning: Whenever you make an Intelligence (History) check related to the origin of stonework, you are considered proficient in the History skill and add double your proficiency bonus to the check, instead of your normal proficiency bonus.   Duergar Magic: When you reach 3rd level you can cast the Enlarge/Reduce spell on yourself once with this trait, using only the spell’s enlarge option. You may use this trait to instead cast Invisibility on yourself. You don’t need material components for these spells. You regain the ability to cast this spell when you finish a long rest. Intelligence is your spellcasting ability for this spell.

Languages. You can speak, read, and write Common and Dwarvish. Dwarvish is full of hard consonants and guttural sounds, and those characteristics spill over into whatever other language a dwarf might speak.   Extra Language: You can speak, read, and write Undercommon.