Plesen is right, the game should be balanced, and if the core game doesn't have unnecessary complexities, then the additional complexities in the expansion are also unnecessary. Excessive complication reduces interest in the game. Although, overall, the idea is good.
Справочник по НоММ-4 http://handbookhmm.ru/pamyatka-dlya-heroes-iv.html
Памятка по НоММ-3 http://handbookhmm.ru/pamyatka-dlya-homm-iii.html
и HotA http://handbookhmm.ru/vyishla-obnovlennaya-pamyatka-dlya-homm-iii-hota.html