Rescuing Lae’zel

The first time you’ll be able to take advantage of your dark visage is when you happen upon the Tieflings who have caged Lae’zel. Speak to them and they’ll remark on your heritage. Pass an incredibly low Intimidation check (courtesy of natural Drow intimidation) and they’ll leave without putting up a fight, leaving you free to reunite with your Gith ally.