IMO, humans have a useless special ability. Yours isn't great either. The undead have a decent one, but it doesn't always help. It depends on luck. Compared to elves, where this luck is 100%....
Mages – interesting, but you spend a skill point on machines. On the other hand, there aren't that many useful spells, and you might not reach that level, or you might get them earlier.
Call of Urgash – an interesting ability. Call of Urgash + Wide Gates of Hell + Fast Gate Opening + Gate Lord = Death to Everything Living in Ashan. The only downside is that the skills for this special ability are very useless.
Pure Rage – interesting, but not very helpful. A well-developed hero already gains rage quickly.
True Luck – the majority voted for it. You have to take less-than-ideal skills, but on the other hand, you get a *2.25 bonus to troop damage for free. Even from a normal person's perspective, this is a huge advantage over other special abilities. Although, in my opinion, you still have to reach that level, and elves already have luck at level 5, so why bother?
Absolute Defense – an excellent special ability. It guarantees the invincibility of your squad. And if elves, even with their luck, have a chance of simply dying, then with dwarves, you can expect a long battle, the outcome of which can be changed even with small forces. Combined with runes, innate defensive skills, and units, you can also take Defensive Hird + Readiness, Attacking Hird + Retribution, Rune Harmony + Inspiration. And enemies won't even be able to attack, and if they do, runes will always save you. Everything would be great if it weren't for Fire Magic and Summoning Magic. Well... what can you do.