Saruman
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Ah, if only it were that simple. The Bastion team worked on a mod for Heroes 3 for about a year, and making a mod for Heroes 3 is actually easier... I think it's feasible for you to seek help on d2f, gather a team of developers there, and gradually start working on it, but first, you'll need to develop a detailed concept... But in general, this is a very time-consuming task; the main thing is not to burn out!