Heh, sucks, doesn't it? If you're a fellow necro, then the best thing to do is to fight fire with golem

I don't believe Iron Maiden affects ranged attacks, so that might help... if you're a barbarian, you're pretty screwed until it wears off. Paladin should use thorns aura and rush the necro (scare him into attacking you, avoid his creatures!). This is just what I *think* might work, merely suggestions... I in no way am implying that I know what I'm talking about
You can also try blinding the caster with dim vision if you're a necro (basically, reduce his sight to nil. When Iron Maiden wears off (and it should wear off before Dim Vision) nail the SOB with bone spirit or bone spear, or a well placed corpse explosion
