NHF – new heroes for Heroes V 3.1.

I love demons! In Heroes 5, but I can't stand them in Heroes 6.

In Heroes 6, I liked that the Inferno units represent the first infernal lords (Ur-Hekon, Ur-Aazeel, etc.) who were created by Urgash in opposition to the elemental dragons born of Ashan (Silanna, Arkat, etc.), rather than just a bunch of random infernal creatures.
The problem is that the concept is interesting, but it's implemented in a way that's very "hit or miss."

Added 3 minutes later

Nobody knows anything about him. Except for his reign in Shi'o, his mysterious nature, and his deeds after that.

You can use the following materials for his biography: http://ru.ashan.wikia.com/wiki/Кха-Белех