Can he use mummies? Their ability isn't as overpowered.

Mummies are good, but they have resurrection and 100% dispel (negates enemy ranged attacks and provides additional attack for the Necromancer - it's devastating in terms of damage output)... I used to use them for one hero in an old mod, but I think I overdid it... If he earned them somehow (resources, time, sacrifice...), maybe it would be great.

Added 2 minutes later
If anything, maybe he could specialize in wolves or elementals?
For example, I once wanted to create a hero specializing in wolves, but it seems that idea didn't work out.