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It is quite possible to find a use for the human ability.
Surely, the developers couldn't have discriminated against humans so much?
If humans manage to withstand the rush for a month, you can completely ignore griffins, armored knights, and archers; don't buy them at all (let them accumulate).
Buy Elaine in the tavern and purchase peasants to accumulate money.
Buy only archangels and Isabel's knights, and monks to train them into the aforementioned knights.
By the way, selling artifacts might be a very good bonus to your income.
In the end, the human army will consist of many Isabel's knights and archangels, who will resurrect these knights.
If you play as Axel (my favorite human hero), these knights can eliminate two enemy units in the first turn (the range provides a very large additional damage). In this case, there is simply nothing to fight except Isabel's knights. And in this case, the human ability (in this specific case, Axel's, whose oversight is even stronger) is very useful.