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Mish-gan against a Necromancer is probably better with light spells for a Demon... it works pretty well: mass haste, mass stone skin, mass punishing strike, mass divine might – it all depends on your preference, but anti-magic is essential.
And if you also have Marbas, it's even better!
I didn't used to think that Inferno was good in the late game, but now I'm sure it is! :smile54: