I can say one thing – the mission wasn't difficult at all. Even though I was playing on Hero difficulty, there were no real challenges. After the first week, I left the portal, captured one Necropolis, then bought a second, and the game was almost complete. Many people here talked about spells like Resurrection and Dominate... I have no idea how you got them. In general, I had to capture Al-Safir using spells of levels 1, 2, and 3. But you seem to forget about such a great artifact as the Unicorn Horn Bow... I combined Titans, Mages, and the best units from two Necropolises – and without any difficulty, I captured the capital. And by the way, Zehir resurrected units much better than Markel (in the third campaign, I couldn't get the Summoning magic).