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I completed this scenario on Hero difficulty.
Walkthrough
I made Nicholas my main hero, and he developed without any problems. On day 20, I captured Abi-Libur without any losses and started developing Stefan. On the fifth week, Razazak arrived but didn't attack; he just ran around the map. Soon, Robin arrived, and Nicholas, with vampires and ghosts, went to kill him, while Stefan remained in the castle with the rest of the troops. It's essential to kill him to protect the dragons. The battle with Robin is difficult; I wouldn't have won without Nicholas's new specialization. I suffered 98 ghost losses. Then, Razazak approached Abi-Libur, and the danger level was low. I attacked with Nicholas, leaving him with one unit to raise all the others... And suddenly, I realized that I couldn't win without losses because, with his specialization, vampires can be summoned unlimitedly. The battle dragged on, and the game started to lag, so I reloaded. If you don't attack Razazak, he takes the starting city. In the end, I had to attack twice with 14 ghosts and retreat (Nicholas is allowed to do this), after which Razazak didn't want to attack anywhere.
Nicholas learned vampirism in the city, took the unholy scroll, and fought against neutrals. He also started developing Zoltan. Stefan stayed in place and blocked Razazak near the abandoned mine in the center of the map. When Robin came again (danger level low), Nicholas blocked his path to the dragons. Robin ran to the Dungeon, and Nicholas blocked him there. While playing only with Zoltan, I got him to level 20 and accumulated an army. I put him in Stefan's place to block Razazak (I didn't want to kill him, in case there was a script for his resurrection). I transferred the troops to Nicholas, and he killed Robin without losses using only messengers. Nicholas went to the Dungeon and attacked Coldwell. The battle was not difficult, and I won without losses. Robin appeared again; first, Stefan blocked the dragons, and then Nicholas ran there and won without losses.
I put Stefan near the portal to block Robin. Nicholas continued to win without losses and without problems, using messengers under vampirism. First, he defeated the Knights, then the Mages, and finally, the Elves. I defeated Fai'den by defending in the castle; I didn't specifically put out vampires. The battle was easy, but I waited a long time for him to spend his mana, and I won without losses. The scenario was completed in 247 days.
I have a question about Nicholas's specialization: is it really intended that there is no limit to the number of units that can be summoned in one battle? It turns out that sometimes it's better not to deploy vampires because there will be too many of them. :)
I liked the scenario; it has many interesting scripts, including combat scripts, new creatures, and cutscenes. The quests are excellently described, very detailed, and important explanations are highlighted in a separate color. In terms of gameplay, this scenario turned out to be more about playing on the strategic map; I only had one difficult battle (the first battle against Robin).
Thank you very much for the map!