Heroes 5.5 WarGame Edition - Tactical Edition.

Nonsense. It's all against logic. Without logistics, dwarves are useless. Dark elves with magic is strange. Barbarians have a lot of special skills in education. Demons, on the contrary, are good at defense. Mages study martial arts. What's the point of possible and impossible skills!?

The main reasons for developing the idea were: leadership for the necromancer and education for the barbarian. Barbarian education stands out from the general system (besides, it's buggy with a mentor). All common bases have common perks, especially at level 1 (for example, in defense, everyone has: resilience, resistance, evasion). But barbarians don't have that in education. Instead, they have unique perks, which naturally translate into racial perks. Why was the "endurance" perk forgotten in education?

That is, there was a choice: either to patch up necromancer leadership with additional bonuses for leadership, retribution, empathy, or simply to ban the base. The situation with barbarians is slightly different; barbarians have 6 incomplete bases (suppression, chants, and education), of which education is clearly atypical and not really needed for barbarians. Instead, the freed-up perks can be distributed among other bases, making them more complete.

Plus, it fits the numbers: 20*3 + 10*3 = 90% for primary and secondary bases, and the remaining 10% are divided by 2% among the other 5. It doesn't divide by 6.

Added 2 minutes later

Humans - light
Elves - luck
Mages - education
Dwarves - defense
Orcs - leadership
Undead - darkness
Dark elves - magic
Demons - attack

Well, I'm really disgusted by the mono-light human. This isn't Heroes 6-7, and the prototype isn't abstract, cloying fireflies, but real humans from the Middle Ages. And it's not a magical race to base it on a school of magic. Why should a knight have 20% primary skills in light, if there's a paladin for that, and the knight is more of a fighter?

Regarding dark elves with magic, it doesn't suit all classes. It definitely doesn't suit an assassin. But darkness can be a common skill, which follows at least from the name of the race. As for the undead and darkness, the reanimator class definitely doesn't need darkness in the primary bases; its task is to resurrect corpses, not to create abominations.