That's the problem, and it's the same in SoD! You have to fight them a little differently!
And I want to learn Armageddon!!! I wonder, if you flee from a battle, can you learn it, or do you have to win the battle? Something isn't working.

Interesting question! I can't learn anything when I flee! Maybe it's just not possible.
And what do you mean by "differently"? The path is still the same - devils and hydras!

Added after 9 minutes

Interesting point. One hero stands on his own territory, the other on his, and what will happen in the arena?
+ in the tournament, there should be at least one round where magic really matters! :) :)

It's simple. The heroes attack each other in turn. That is, each stands in defense on his own territory (as in the save), and attacks on the territory chosen by the opponent.

I don't know what will ultimately be decisive in the arena, but it seems that without a huge amount of mana, it's impossible to defeat the golems. And that's 5-6 levels lost for the warrior! And minus Armageddon!!! But can a mage defeat the golems???