1. Hagraven( That fireball it spams can kill me in seconds if i'm not careful)
2.Mages ( ward spells help me out now but man 2 or more mages and a atronach can be deadly)
3. Falmer( they hit hard but I believe I wasn't suppose to be in that area at my level so who knows)
4.Trolls( regenerate health is the main problem)
5. Dragons( Yes I know dragons are easy but playing on master one shout can kill you instantly and I rarely use bows for dragons because it takes the challenge out of the fight)
Which enemies are sometimes a pain for you? If nobody sometimes gives you trouble who use to give you trouble?