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I was playing as Necropolis today, and on the 4th month, I went to a friend's game and lost – I'm so embarrassed!
But there's still a chance with Deidre (I actually played as Zoltan with my friend). If the opponent plays as Erling, even if you take Quick Mind and Enchantment/Light spells (and Light works against Necropolis – I would focus on Eternal Light and other gnome spells) and Battle Spirit, it won't be enough to protect the gnome – there's a chance! (I would try to develop Rune Harmony on the gnome's side). But then you need to try to develop the Silverback skill. (I don't trust her; she's a bit slow, but that's just my opinion). I don't even know how much the scream will reduce her stats – -2 or -3 units, even with Necropolis artifacts. Why drag it out? Just attack him with Orson on the 3rd week, and you're good to go!