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A must-have depends on the hero, as you understand.
Since Necropolis usually plays with Sacrifice, in my opinion, you need a Tears Mage. I advise you to look towards Earth and Fire magic. It will allow you to survive the intense barrage. Of course, max out magic resistance in the beginning.
I've won many times - I can share details in a private message.
P.S. Or take Haven and crush the Necropolis. =)
Since Necropolis usually plays with Sacrifice, in my opinion, you need a Tears Mage. I advise you to look towards Earth and Fire magic. It will allow you to survive the intense barrage. Of course, max out magic resistance in the beginning.
I've won many times - I can share details in a private message.
P.S. Or take Haven and crush the Necropolis. =)