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Well, yes, Messiah is a kind of RPG. It's an action game with RPG elements, set in the world of Ashan.
As for the foreignness, I'm not sure. In my opinion, the styles of Heroes 5 and other Ashan games sometimes blend quite well.
Of course, there's a difference in detail. But this is more of a problem with Heroes 5. No matter how great it is in terms of style, the angularity of the armor is undeniable. Now, you can do better and still maintain the overall image and style.