It's very strange, but when setting both Cerberuses (blind dogs) and Hell Hounds (beetles) to the TOWN_SPECIAL race and removing the grade/pair creature setting, the game consistently crashes. It seems there's some hidden connection between these creatures that prevents them from both being neutral. 🙂
By the way, if you only make Cerberuses neutral, everything works fine...

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