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You can apply effects, but not based on the terrain, which, as far as I know, cannot be checked with scripts. Instead, you could search for characteristic objects of the terrain (specific mountains or trees, for example). However, I have never done anything like that myself, except for searching for heroes.
I probably shouldn't mention that the code would be long, complex, a patchwork, and not 100% reliable in all situations.
I understand... that's a shame... but it would have been cool! :smile26:
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