I don't know much about 3D modeling and what program is needed for it. I only know about mirror and gloss textures for reflection. Is there a simple converter to the required format?
It's simple! Take this creature and remove its axe and shield; they are made as an effect... then restore the rest using the original textures!

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