I found an interesting mod that changes the balance: it improves skills, slightly hinders progression, enhances spells, and changes some units. As I understand it, it won't be compatible with your project, right? The mod is called: extra

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1