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Finally beat it, but not as a hero... Phew...!!! It was harder than ever. And I only won conditionally. I started with Aetos from the Dungeon faction. I fought with 2 stalkers in stealth mode until they were invisible, poisoning and killing them. The armies were so large that no race could withstand them, and meanwhile, the army was slowly accumulating in the castle. I poisoned them on the approaches to the castle, then flew to the tavern and attacked again with 2 stalkers. In 2 attempts, 3 weeks' worth of reinforcements from any city were eliminated. And another condition: there were no undead against me. If there had been, that would have been it – I would have lost.