Thank you, but that's not it. I remember there was some mod for all the Heroes games that featured a lot of different heroes. A huge number of heroes.
Added 4 minutes later
Oh, and I forgot about NHF. It's the highest quality of all the Heroes mods, but it's also the most complex. First, there were scripts that had to be activated on the maps, otherwise your heroes wouldn't have any specializations, and then they apparently created a new engine so that the combat scripts would work