We're aware of the issues some Blender uses are having with the FBX ASCII format of our updated hero reference files. As a test, we have created FBX binary files for Undying available to download at http://www.dota2.com/workshop/requirements/Undying

Please download and test using the files within this zip in Blender and other packages and let us know how they work by replying to this thread.

Thanks for your help with this.

The Dota Workshop