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Ah, if only it were that simple. The Fortress team worked on a mod for the third Heroes game for about a year, and making a mod for the third game is easier... I think it would be a good idea to ask for help on d2f, gather a team of developers there, and gradually start working on it, but first, of course, you need to develop a detailed concept... But in general, this is a very long process, the main thing is not to burn out!