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Here is a mod that adds dark knights to the Necropolis Castle:
http://cp.people.overclockers.ru/cgi-bin/dl.pl?id=15227&filename=Black_Knight_Mod_for_HoMM5.exe
And here is a mod that adds a load button to the menu during battles:
http://cp.people.overclockers.ru/cgi-bin/dl.pl?id=15230&filename=Fix_ButtonLoadInCombat.rar
http://cp.people.overclockers.ru/cgi-bin/dl.pl?id=15227&filename=Black_Knight_Mod_for_HoMM5.exe
And here is a mod that adds a load button to the menu during battles:
http://cp.people.overclockers.ru/cgi-bin/dl.pl?id=15230&filename=Fix_ButtonLoadInCombat.rar