NHF – new heroes for Heroes V 3.1.

Here's an opinion about Ula, for example.

I don't see how Ula can be effectively played using light magic on small maps and chaos magic on large maps, and consequently, at different levels. Any ranged unit using light magic has enough mana, which leads to the conclusion that special abilities and light magic don't synergize very well. (This doesn't mean that special abilities are useless for light magic.)

It's more interesting to play through chaos or summoning, as special abilities work better there. The starting skills and spells look good, as I already wrote – this hero doesn't seem like an outsider.

As for Faydaen, there's a feature against a real player: if they know which slot to put the single-target spell in, Faydaen will always use his special ability on it. I don't see a way to fix this; it's simply a disadvantage for the hero.