“Flight to Salvation” – “Deeds and Paths of Darkness” [4th campaign, 1st mission]

I just finished the mission, playing on Veteran difficulty. It took me 3 months. Unfortunately, I didn't complete the dwarf's quest to return the blacksmith's hammer because I sold the artifact before I unlocked the quest. I restarted the mission many times to make sure Zehir still had the summoning ability. In the end, I chose these skills:
Expert Summoning, Expert Luck, Expert Master of Artifacts, Expert Education, Expert Chaos, and towards the end of the mission, I got Logistics. I finished at level 27, I think. For magic, I upgraded all summoning spells and all Chaos magic spells. I was lucky with Light magic and got Regeneration, but for some reason, I didn't get any travel spells in any of the castles, neither Astral Gate nor Portal to Town. By the way, I just noticed that the fifth guild of mages now has 2 spells. Is this specific to this map, or is it in the entire expansion pack? I don't remember having two spells at level five in previous missions.

Overall, the map wasn't too difficult. There was only one challenging battle against the hero Vaishan. He had some good artifacts, and his army attacked very often due to his high luck. The first time I attacked him, I lost almost everyone. The second time, after reloading, I only lost half. After that, it was easy to just walk around the map.