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regarding the normal map, by the way. There's a simple way to use it in Heroes 5. You can make the normal map colorless and simply overlay it on the diffuse texture in Photoshop. With a layer transparency of 50-60, it looks quite good. It adds volume and shadows to the texture.
Of course, it's not exactly "the right" way, but it's still better than nothing. Since we already have the maps.
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And it seems that there is indeed a way to export a single texture from Substance. Now I just need to find out how to do it.