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no, it's in \GameMechanics\RPGStats\DefaultStats.xdb
separate files for objects and spells are just useless templates; nothing changes except the price, icons, and names
Added 2 minutes ago
I checked, there is no such parameter there (the increase only changes for the goblin trash mob)
Added 12 minutes ago
damn, only dwarves and orcs have an additional increase that changes....
https://disk.yandex.ru/d/WXUEoW0twDSv3w
To install, you need to place Yoba_mod.pak in the Heroes5\data folder
And H5_Universe.exe in the Heroes5\bin folder
Run it using H5_Universe.exe