Creating your own hero.

In the editor, click on the hero, look at the left panel of the editor, find the "Shared" line there, and click on "...". Then, among the lines, you need to find "Specialization" and select the desired one from the drop-down list. To change the name, image, and other things, you need the parameters "SpecializationName", "SpecializationDesc", and "SpecializationIcon". The names might be slightly different; I don't remember exactly, but they should be similar.