Believe it or not my first exotic was from the very first nightfall I did and it was the gjallerhorn. I had been playing since the Alpha on PS4.. It was not even famous then. I almost dismantled it..I was actually upset cause I wanted the truth instead..
it was the "stoïque" in french, the snip that can put you invisible when you'r on your knees and still have the radar while aiming, doing electrical damage and had 6bullet instead of 4 in the magazine ~