Custom monster issue!

[WALP]

The monster in the screenshot is NOT 6 K polygons.

It just isn't, go fix it, you can't use a model made in sculptris, sculpts are made to bake as normal maps onto low poly models, the reason for the file size is because this model has a massive ammount of polygons, which the engine itself won't like.

he said that he had ported it into blender,
I assume that he has done a retopology which is 6k and baked the high poly onto it. But I guess you might have a point since he only mentioned rigging it in blender and "etc.". the model in the screenshot is surely a sculp though since normal maps cant really enhance the silhuette.