Demon invasion.

The difficulty is the highlight of this campaign; I've played it four times, and it's still challenging, which makes it interesting. Of course, playing on Hero difficulty requires a lot of luck, especially with the initial skill rolls, and for a quick playthrough, you also need to check the map for random neutral creatures. But playing on Hero difficulty is a challenge; most players don't need it, and the lower difficulty levels are perfectly acceptable. Although, even on Hero difficulty, it's not that difficult if you act strategically (and there are several guaranteed paths to success). Right now, in the second scenario, everything is going great. I rolled Sigrif with a leader from a chest and got a relic from a witch, but I had to struggle and even defeat bears with just one spell. Later, even with level 2 spells, it was difficult; I ignored many neutral creatures at the beginning, but then I faced Zealots + 2 packs of Golems, and I managed to get the Secret Keeper from them. After that, everything went smoothly. I found Chaos, got the Phoenix Cloak, and defeated Necropolis even without a Blood Dragon. By the time I reached Shio, I'm thinking of not rushing out of there and instead collecting and upgrading the local demons, but I don't remember if there's an extra mine there. On the surface, things are also going well; I found Djinns on the portal and defeated him by the third week. Before Beni arrived, I reached level 21, got good Darkness creatures, and a Wide Gate. I also got a week of alliance before his arrival, so I felt sorry for Beni - . Next, I'll try to act as quickly as possible, summoning as many troops as possible from the surface with Sigrif, so that I can defeat Kha-Belekh as quickly as possible.