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basically, I was developing the hero's combat spirit and luck, that's the priority. Spells are obtained along the way to the Dragon Utopia. + I put on the hero 2 rings of broken spirit (as far as I remember), which I found along the way.
I discovered another unpleasant thing - beautifully destroying legions of devils near the dolmens of knowledge seems to guarantee that the game crashes:(
I played around with "dancing with the tambourine" - still, crashes occur due to zero addressing already when activating the dolmens...