- A reference guide and manual in Russian for Heroes 3.

How is that even possible? You can calculate the actual (not manual) probability of getting Earth Magic/Logistics.

Tootsie Pie, I agree, information about the skill trees is useful, but this system is quite "obscure" in the sense that it largely depends on chance, and it's not obvious what the game will "give" you when you level up.

How many times has my hero not received the desperately needed Earth Magic or Wisdom!

The skill tree is fixed for each hero when the starting save is created and does not change during the game (exceptions are noted below). It's not very difficult to determine the optimal skill build for a specific hero by trial and error before starting the game. This applies to offline play. In online play, no one relies on leveling up a specific secondary skill for their hero. I don't understand how information about the probability of getting one skill or another will help you in the game. It either exists, or it doesn't - and it's quite possible to check.

The skill tree is only "broken" in the case of obtaining a secondary skill for the Witch, the Scholar, at the University, or when a quest set by the map author is triggered.