NHF – new heroes for Heroes V 3.1.

There's a mod that adds all existing heroes. Each faction gets about 5-6 new heroes, or even more. Many have unique specializations not found in the standard heroes. Others have specializations that are duplicated from heroes in the standard set. Search for it on Google. If you can't find it, I can send you a ready-made version. It works with versions 3.0 and 3.1.