I did some more research and it turns out I'd need 7.5k-8.5k void auras for NSoD... That's 5 months of dailies (not including gifting Gravelyn - not sure how much you get from her per day), or approx. 300+ hours of retrieving void auras (-16 hours for every 2x void auras day, assuming I grind for 8 hours on those days).

I really wanted it, since it has a lot of cool appearances and half of that 51% weapons in the game are derivced from it, but getting NSoD as F2P really feels hopeless.
Unless there are other ways of getting void auras that I'm missing?