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I also prefer the Dark faction. I advise you to choose a higher difficulty level, as I haven't made any major changes to this map yet.
I always start with a hero. It's more interesting to play that way.
I've already defeated the 3rd Green Castle. The Knights are expected to arrive soon (it's the 2nd week of the 2nd month) - I wonder what they'll bring))) I'm planning to merge their troops with mine and switch to them. I just need to find some gold for reinforcements.
It's a pity - I made Sigrif my main hero, and he has 8 attack and 6 defense at level 22. I freed Rielag, who has 17 and 21 respectively. If only he had Logistics.... =))
I haven't seen the Turquoise faction yet - I'm starting to worry about him... I hope that jerk doesn't create 300 vampires=))
Added 30 minutes ago
Oh, I found a mentor=)) Now I just need to finish off the Green faction, meet the Knights, and I can start building my base around Rielag))))
Added 20 hours 15 minutes ago
On this difficulty, you can increase the size of the incoming army of humans and the hero's stats.
This army is kind of pathetic; the losses are about a dozen units due to the hero's lightning spells.

Added 4 minutes ago
Another thing. There's a great artifact lying around, but I can't pick it up. Is that intentional?

Added 1 hour 40 minutes ago
How do I remove the magic barrier to kill Faidaen? It's already the 3rd month...
I've defeated 3 Green Castles... another Green faction arrived, and I defeated him too. How do I force them to surrender??