Perverted mind

I was never a great player, so I could only complete this myself on the "easy" difficulty. And even then, the first encounter with the main mage turned out to be completely hopeless for me – I had to reload from a much earlier save. I won on the sixtieth day, simply luring the mage onto neutral territory, outmaneuvering and overtaking him to capture the necessary city. In that city, there was his "level 6" unit, which was again quite strong and definitely outnumbered me, but I managed to win.
Berserk didn't work on me, even against weak neutral monsters, so again – I don't know.