VDV_forever
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The patch is already out! I asked a friend, and he didn't find any artifacts that even remotely resembled set items! (In Heroes of Might and Magic III, some were clearly similar to set items, at least that statue of... what was his name, I forgot):(
The Legion Statue; it adds a 50 percent growth bonus to the city.
P.S. For those who want to install the patch:
http://heroes.ag.ru/heroes5/files/zip/heroes_might_magic_5_rus_101.exe