I haven't seen anywhere where a 4th (NCF) column for recruiting alternative creatures was implemented, so what if we created alternative buildings that could provide different creatures.
Buildings for recruiting some creatures from NCF exist, but they are still in the alpha version...

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