NHF – new heroes for Heroes V 3.1.

Well, what if there are many of them?

Yes, the situation is quite interesting; they have an overpowered passive ability, and if there are many of them, it will be overpowered. But if there are few of them, it won't be very effective either. Maybe create a new unit with the model of a Death Knight and make it roughly as strong as a level 6 unit, and slightly increase its growth rate, say, +1 for every 10 levels.
It's just that a player won't let Death Knights attack in such small numbers, but the Companion can be defeated with anything, so I would like to slightly strengthen its special ability. But this is just my opinion; I'm judging based on one game and theoretical ideas, which aren't very good.
I played as Halphas; he's a good hero, everything works, the attack when a Demon Lord ally is about to die is applied, and I had a +9 attack bonus (from 3 Demon Lords).

Added after 2 hours 22 minutes
I played as Moander; he's an interesting hero, it's a pity that he doesn't transform faction-wide buildings into undead buildings. And he's not very good against bots; they quickly develop cities. He will be good on maps with an advanced generator, where there are 16 or 24 Castles.

Added after 7 minutes
Although, such maps are for masochists :D

Added after 57 minutes
I played a little as Sandro; I don't understand, does he take 25% of the creatures and turn them into mummies from all Sorceress units, or only from one (if there are several)?