Auto-translated
Actually, as I understand it, creating new models and new animations isn't that difficult in principle. It's quite possible to add new heroes and creatures to the game, and I've already managed to create a new hero. Of course, the model is old, and the animations are also old, but creating new animations and a new model isn't difficult. The problem is that it takes a lot of time.
I've already created one animation, and it performs its function quite well. But I'm definitely far from being an expert – I did all this in about a week after watching a couple of tutorials and experimenting through trial and error. To be honest, I'm surprised that most of the mods for Heroes 5 are changes to models or their replacements, as well as textures, but I haven't seen any new animations yet. When I just started modding – and I still consider myself a complete newbie – I thought I would be able to find something completely new. But no, it seems a bit empty here...
I don't know if I will delve deeper into all of this, but I find it quite interesting.