That's great because I encountered the same problem (the main enemy is unkillable) even on normal difficulty. At the same time, it's frustrating that the only way to win is to level up the main hero's dark magic and use the Dominate spell with a Berserker. Maybe on normal difficulty, the enemy level should be reduced? Otherwise, it creates too much contrast with everything that came before:smile09:
The creature growth rate has been reduced on all difficulty levels, so give it a try.
Multiplayer: Господство, Извечное противостояние, Война за Магию, Торговая империя, Анатомия войны, Эксперимент
SingleScenario: Последний Рубеж, Трон, Элиралис, Вернуться домой!, Лабиринты разума
Campaign: Колонизация