after hundreds-thousands of hours (depends on the clock you look at I guess) I'm gonna go with RNG, I know xur had it week 2, while I was still a mere lvl 15 and had no strange coins to rub together, but I still have no gjallarhorn. and yet I've carried many first timers through the raids and several times they would get the gjallarhorn on their first vist to the exotic chest one of which was literally at hour 30 or so of playing the game. this i'm sure is RNGesus poke at my misfortune. so yes, to summarize my most hated enemy in Destiny is by far the RNG