Ranger - "Higher Vampire" [5th Campaign, 5th Mission]

Well, I also had a 100% chance to defeat him a couple of months earlier, but I like to max out my hero, visit all the upgrade locations, and clear the entire map, so my playthroughs rarely end in 2-3 months. Mostly 4, sometimes 5.

Here, the longer you play, the more powerful the enemy's troop growth becomes. But no blitzkrieg is possible either. For example, right now, it's the 2nd month, I just took that "Orange" location and sent Talanar there. And someone needs to go for the artifacts in the basement after receiving this quest in the hut; it's not necessary that Faidaen takes them, but he's the one who receives the quest and also the one who claims them later. So, maybe Talanar can be sent with undead troops.
By the way, it's only in this mission that Fedya received Resurrection, even though I built guilds to the max everywhere.
P.S. Slightly off-topic: I played the "Battle Cry of Freedom" scenario in the Orcs twice, very slowly and deliberately, and both times the result didn't make it into the top 10; I played for 6-7 months, and the hero reached level 26.