you grew up in the underdark your distant ancestors colonised this part of the underdark. due to this you are able to traverse the dangers of the underdark. your family doesn't talk in their native language any more. they have learned undercommon and have build a thriving civilization with all kinds of people. in school you where taught undercommon and the language of your race. the main focus of these kinds of societies is to teach the coming generations, how much their ancestors fought to get them this position of privilege in the underdark. the society also has its own currency of mithral pieces (1mp = 20 gp), rubies(1 ruby = 2 gp), damascus pieces (1 dm = 1sp ) and bronze pieces (2 bp = 1cp).

Skill Proficiencies: you are proficient in the skills survival and history

Tool Proficiencies: you can choose any set of artisan tools to be proficient with

Languages: you know undercommon

Equipment: a set of artisans tools (you can decide which one), a dagger, a lucky charm this can be anything of the trinkets table, a set of common clothes and a pouch with 5 rubies.