With my lvl 35 battlemage (Dumner) I usually get the high level ones, which are resistant to magic. They also seem resistant to poisons (unless I use particularly strong, multi-effect ones) and their hide is tough as nails against my enchanted daedric longsword and bow. Plus, they're quick (and their shrieking sounds like fingernails on a chalkboard). How do you deal with them? Any recommendations on weapons, enchantments, etc?