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Yes, the fact that Necropolis has a balanced set of heroes is true.
But sometimes it seems to me that the special abilities of different heroes are not always entirely equivalent.
For example, the Orc Keagan – after a certain period, a number of goblins join him, equal to the hero's level – but this is actually complete nonsense, not a special ability, and it can't even be compared to Nimue from the Dungeon faction.
All the Necromancer heroes are better than Keagan, but far from all of them (for me – so far, none) have a better special ability than Wingael or Nimue. I agree that initial skills are also very important, but they are also very good for Nimue and Wingael.
For me, Lucretia is the best so far.