kiko
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I actually have an idea to give humans "Retribution" as a super ability instead of "Unrelenting Force." This might allow it to compete with "True Luck" or, for example, "Absolute Defense" (although it would still be weaker, but "Unrelenting Force" is just too weak to be a super ability).
P.S. Regarding "Retribution" - elves also have 25% luck...
The Spellcraft skill can compete due to the choice of skills through which it is learned. For example, dark elves learn Spellcraft only through useful skills, and that's overpowered.
For humans, if it learns through "Diplomacy," through the three main light skills (without "Guardian Angel"), and through "Retribution" (if it remains in "Attack"), it will already be something.
And Spellcraft itself could be an improved "Prayer" with reduced mana costs for light spells.
Personally, I don't like this idea very much; I would prefer to see 10/20/30% attack...
We need to understand that "Attack" plays a much bigger role in clearing the map.
"Defense" only matters for certain units: "Vampires," "Paladins"... and even then, not always / quite rarely.