The necro will need some good gear (lot of HP/mana) and some good sets of buffs to do this. Remember they don't have access to defensive AA's here and their defensive and dodge caps are fairly low (resp. 145 and 75) so they get hit often and hard.
So as an answer: doable? Yes. Realistic? Depends. Sustainable? I very much doubt it.
This reflects my experience as a 51 necro.
|