Considering it was suggested she does Very Bad Things to prisoners, makes her a good guy..right??
She's certainly no saint, I'll give you that. I guess a better example would be Count Hassildor
Well considering all the undead (Vampires and Soul Cairn) we should get something to fight generally all undead with (obviously). As said also Dawn Breaker should find much use here.
I don't know if you have played Morrowind or not, but one of the high level Temple quests has you clear out the base of one of the three vampire clans of Vvardenfell. The guy gives you a brutal warhammer called Veloth's Judgement that made me feel like a badass when I was killing the vampires with it. I am very tempted to make a melee character who uses warhammers and use a burning hammer to smite people with.
Though I am already very tempted to make a crossbow user. Shall'th I go Van Helsing on they asses.
I did actually play Morrowind, but I never joined the Temple. I joined the Imperial Cult, and killed all 3 vampire clans. Glory to the Nine!
You raise a good point though, with the soul cairn, there's bound to be anti undead weapons