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I came here just to find out how to finish the mission.
I'm probably doing something wrong.
I didn't develop any magic skills at all, only combat skills, because I consider the Barbarian a fighter, not a mage.
And he has very few magic points, 2 battles and they would all be over, and they replenish slowly.
During the second mission, I accidentally discovered the "General" Heroism skill on "Kamaz," and that's when I had an idea.
I maxed out the Heroism and Luck skills of my hero and stocked up on a ring that gives +10 to initiative (whoever goes first in battle).
The battle goes like this.
I always go first, I cast "General" Heroism, and all my heroes get a maximum and double attack.
Because of this, most of the neutral armies die without even taking a turn.
All battles with the Nagas end on the first turn when I immediately eliminate their frogs and archers.
The only thing they manage to do is kill 2-3 of my Orcs or Centaurs.
In general, I wandered around the map for six months, took everything, killed everyone, didn't lose anything, and maxed out both heroes.
The only difficulty was that I didn't know how to finish the map.
The battle with Muako wasn't interesting to me, so I let the computer handle it.
He, as usual, managed to kill a quarter of my army, but it was no longer relevant.
:)
P.S.
The "Cleave" skill is very helpful, as are all the skills from this branch.