Also, yes, the Aura does stack, it just doesn't show it.
Yes, Dungeons can still be done, only now, my attacks are weaker because I lost HB, but I will figure out a decent counterpart to it. Already ran into LOH and was able to do it, just was a little bit harder because of the loss of HB and some other talents I had going at the time.

Might be better if I had Glyphs for Death/Obliterate.
Going to mess around with other talents specs and see what I can turn up.