race features:
Superior Darkvision. Your darkvision has a radius of 120 feet.
Natural Mountaineer. You're acclimated to high altitude, including elevations above 20,000 feet. You're also naturally adapted to cold climates, and do not suffer the normal ill effects of such environments.
Deep Magic. The dark magic of deep places flows through you. You know the dancing lights cantrip. When you reach 3rd level, you can cast the faerie fire spell once per day. When you reach 5th level, you can also cast the darkness spell once per day. Charisma is your spellcasting ability for these spells.