Heart of the oak would help you alot then.
Also try to put p skulls for regen in the circlet if possible, or even use Gaze for the duel leech.
If your really desperate, and have a few extra skills, (highly doutful with a bone necro) put them into blood golem. (not sure if this works against pvp) Maybe even add a few extra stat points into energy. For the necro I believe every 1 stat point gets ya 3 extra mana (if im correct)
try not to double post, just edit last post. Just saying so you don't get bitched at from someone.