Im currently using a lv 12 Imperial, and stealth tactics that work excellently on Novice don't do squat on Master, against the High Hrothgar Frost Troll. Not even on Expert. Im thinking its my race choice. What's a good race for an assassin on master? And what are some further techniques to employ? Im currently hiding behind rocks at a distance and sniping, it worked on novice, but then i wanted to test my skills on Master, the troll noticed me after the first shot and mauled me, i mean WTF how does that happen

If i remember right Bosmer are good.