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Has no one completed it yet? My hero's magic skill was over 50 at level 30 (hero's special ability +1 to magic per level). ;) Also, the mini-arts on the creatures (especially on the Initiates) gave our troops a noticeable advantage.
There is also a boss ("Hellspawn") that can be recruited. It can defeat almost anyone. ;)
The Vryskian heroes you encounter along the way will not be friendly either. There is a desert in the center with quicksand. To avoid falling into the abyss, you will need to fulfill a certain condition - solve a riddle. Special red crystals give noticeable bonuses, depending on how many you visit. Starting with Chaos magic and a decent magic skill makes it easy to break through. Also, the manticores have been changed: a book has been added with very good spells. You can already recruit creatures of the second-to-last level almost at the start... and so on. :)