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If you rely on the developers' intentions, you can, for example, play with necromancy specialists, building enhancements and upgrading vampires. We don't play that way; that is, the developers' opinion is not always a dogma for us.
By the way, VLK, can you ask your question about multiple guards to the random map generator developer?!
http://forum.heroes.by/viewtopic.php?t=856