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In general, the strongest Necropolis hero is Sandro, not because he was in the campaign, but because his abilities are excellent. By level 10, his magic will be amazing (if, of course, his Strength is at least leveled up to 5, although it's better to level it up to 10)).
As a counter to the Necromancers, I choose either Dungeon or Fortress.
As a counter to the Necromancers, I choose either Dungeon or Fortress.

