Well tbh, Skyrim on master difficulty is a joke because of how unbalanced the skills are. Alchemy, Enchanting and Smithing make you a god. There is no difficulty except enemies having more health and dealing more damage. I spent 300 hours on Master difficulty and BGS still does not know how to deliver a challenge.
Not to mention if you have Dawnguard, Vampire Lord form is basically god mode; especially if you put some traits into it. Every now and then you get hit by one of those insta-death arrows, but...really, you end up just tearing through everything. The default attack does a ludicrous amount of damage, you have two different skills dedicated to restoring health(one of which is a complete heal), you can summon a minion, you can paralyze enemies, bats siphon life to you, and, as if that wasn't enough, you can toss most enemies around like ragdolls. It's really quite silly....kinda fun, but silly...