NHF – new heroes for Heroes V 3.1.

Will there be a hero with a special ability focused on skeletons?

I think that would be too overpowered (remember Galtran from the third game), but such a hero could exist. For example, you could give bonuses for every two levels, or even three (at level 20, +10 might be too much, but +6 would be fine).

Added 1 minute ago

Is there a Necromancer hero with a special ability that gives a bonus based on the number of creatures killed by non-magic attacks, adding a percentage of that number to their dark energy?

That would be quite overpowered. In a battle between two Necromancers, the one with this hero would win (assuming they have the same number of castles and outposts).