Anchored Dwarf

Dwarven Resilience. You have advantage on saving throws against poison, and you have resistance against poison damage.   Stonesense. While you are underground, you are able to retrace your steps perfectly, barring magical interference. You also have advantage on any hearing based Wisdom (Perception) checks made while underground.
 

Languages. You speak the language of your culture, which is typically Dwarvish. If you live above ground, you also speak the language of whatever culture you frequently find yourself in.