"Flight to Salvation" - "Summoning the Dragon" [Campaign 4, Mission 3]

This mission seemed difficult to me because of the yellow player, who kept coming through his portals onto my territory. At first, I defended myself against him, but then I gave up. I built up a town with Wolfstone, defended it when necessary. Zehir emerged on the surface and ran around. I just wanted to complete this mission as quickly as possible because you can't really develop your hero in it. I didn't touch the Erls guarding the entrance to the Dungeon. It's impossible to capture the second yellow Castle anyway because of Hangwul. Although, I heard that someone managed to send Zehir to the Castle. Is that even possible? I attacked Rolf in waves. The first time, I wiped out half of his army with a Berserker, Subjugation, and other spells. I attacked him just out of curiosity, knowing that I would lose. But after Zehir's defeat, he could be hired in Ilm-Hijra! I accumulated a week's worth of reinforcements and attacked Rolf again. I shortened his army again with dark spells. I lost. I hired Zehir again, gathered troops, and on the third attempt, I defeated Rolf. By the way, he's not very good as a hero. He cast Grief on Rakshasas like an idiot, and Zehir deflected it in 90% of cases. That's how it was.