[Baalz]

As I said, I haven't played around with BV much so I'm not sure how it's resolved but my thought was that if you fail the MR roll you attack yourself - so for instance casting a fire spell at a fire immune guy with BV could still hurt you. I may be wrong on that though.

And yes, of course they can go down to spells and smites, though with the blood vengeance and ability to be buffed with lighting, fire and cold immunity, luck, etc. seems like they'd be more resistant to that than most.