The nebula glow shader only hunters can get, but I finished all hunter related quests including night stalker but never got it. (Unless I have to do some pre-TTK quest?). I got surf breaker and mercurial dawn when I did their respective quests. Nebula glow isn't in my shader kiosk either. Don't know if maybe my shaders were full when I did the hunter quests but I would really appreciate if someone could tell me how to get it. Thanks