race features:
Darkvision: Darkvision up to 60ft. everything shows in shades of grey, unable to identify color.
Two Heads: The Ettinborn has advantage on Wisdom (Perception) checks and on saving throws against being blinded, charmed, deafened, frightened, stunned, and knocked unconscious. When one head sleeps the other is alert.
Underdark Born: The time that the Ettinborn spent in the cold dark depths of the Underdark has caused them to gain resistance to cold damage.