NHF – new heroes for Heroes V 3.1.

With such a demon, it will be easy to cheat by building an army on weak mobs. And all summoned creatures are counted.

Added 3 minutes later

Cons:
1) I wouldn't want to have anyone related to dragons. These units are quite strong. Although the black dragon is weak on its own.
2) It turns out to be a repetition of necromancy again.

But there is also a plus:
1) Necro-dragons are rarely used in the game. A specialist for them will enhance this possibility.

We can think about it and change the special ability without deviating too far from the theme. But how...