This is the kind of thing I believe will revolutionize PVE and even maybe leak into a bit of the characteristics of what the Darkness can do or become. With the right drop rate, and the right way of presenting challenges to complete what seems to be an exotic bounty (noted in edit 7) you as a player can feel like you're actually holding an exotic weapon and feel like you've earned it . You can feel the pride and luck of the draw in the world of Destiny by wielding what very few have been able to come across. I therefor BUMP this idea for my dear friend Garet.