The enemy type that is causing me the most trouble are vampires. I can deal with the lower level ones, but if I meet a high-level vampire I usually die quickly.
I'm playing a Battlemage using Conjuration, a bit of Destruction and a legendary orcish sword. I'm also wearing legendary Dragonplate.
What are the weaknesses of vampires, and how can I prepare myself against vampires? What tactics are effective against vampires?