Sap essence is a bit weak in terms of healing per magicka spent, compared to similar mechanics on DK or Templar, but its better than nothing.

I find Leeching/Siphoning strikes to be a decent source of sustain, espeically since I'm also Imperial, makes my LA weave or even LA spam pretty valuable

Not real keen on the lack of CC, fear is aggravating for you DPS and the lack of a root is annoying, aka why my backbar is frost staff.

Not a lot that NB does that S&B doesnt already do, not of group utility, which is why when I get time I will probably be rerolling DK. I rolled NB tank to be a hipster and tbh I dont think it was a great choice.