In the style of NHF, it would be possible to implement a script that checks for interaction with enemy units and, if mummies/knights are present, adds them to your side.
Cool! Is it possible to implement something like that?

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