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I don't remember using a Knight hero for Necropolis on large maps very often. Maybe I should. I'll think about it and write more about it tomorrow.
Gargoyles have a morale penalty of -1, so you can hope they won't have time to act:))).
Good analysis from Alex_R; tomorrow I'll try to describe the ideas that came to me in more detail, although maybe it's time to write an article about the early game for Necropolis (by the way, the article "Practical Numerology" has been written and published).