Necromancer – “Ruler of Erathia” [Campaign 3, Mission 5]

Decided to go through the topics, maybe it will help someone. Fortunately, there are no hopeless situations, just as there are no universal solutions. I didn't level up the hero "in that direction," so I didn't have any Phoenixes (you can imagine I didn't want to replay the entire campaign). BUT!!!!!!!!!! Go to the artifact merchants, buy an expensive chainmail (I don't remember the name), which removes immunity to mind control spells, and that's it, the Titans and Rakshasa (I recruited them) will fight for you!!!!!!!!!! Victory (after five attempts, unfortunately).