To this day I am still missing the first warlock voidwalker subclass fragment, even though I have no access to the "Learning Light" quest. It's not in my quest kiosk nor my quest inventory and I can't pick it up from anywhere. It's great knowing that I am probably never going to be able to use this fragment as this will probably never get fixed. Why not make it so you can replay the new light quest like in the past with Red War? Does anyone know of a way to fix this?