psatkha
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Here it says how to add a skill. The XML instruction is quite detailed. It's not entirely clear how to change the binary – it seems that they changed a certain byte to modify the limit of creatures in the NCF. But how, for example, can I change a specific byte in that executable? And how do I define the skill's logic? (in case anyone knows)
Well, essentially, they simply add a new identifier (in a similar way to how the total number of creature identifiers was increased), but adding new functionality for this new identifier is, unfortunately, not possible yet!
С уважением, Psatkha (Псатха) 
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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1
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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1