I've had this problem since ttk dropped. My hunter is at level 40, and I haven't been rewarded with the shader. The quest isn't in my kiosk either. I've seen a few posts about this, but they never got attention. Is this a known issue / and if so is it being looked into? It's bugging me because I want to get all the shaders.
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If it isn't in your shader kiosk try checking vault and all characters if you have then if you really want it you may have to create a new hunter and get it to level 40