Walkthroughs for custom maps.

Yes, I noticed that too: "Infernal Conquest" = "Hell Bursts", it's the same map, author - Sontu Andrei Silviu, it's unclear why it's like that, although "Unleashing the Bloodthirsty" is also known under the name "Force of sphere prohibition".
Forgot to add: in the archive with the map "Brothers of Mercy and War" on the German website kartenarchiv.de, there is also an author's description (I once played the first 15 days, and there's a Google translation of the events), and there is also a 2nd version of the map. Maybe this can help, although there are no direct tips or hints there. The map has good visuals, but the rest can only be assessed by trying to play it.

"Force of sphere prohibition" I played a long time ago. "Played" is a strong word - in the first month, I got a computer with a legion of spectral dragons (the very ones I managed to get while playing "Unleashing the Bloodthirsty") and a Necropolis. And it was all correct, one to one. Only in Unleashing, I was at least able to get out of the Citadel and take a look at the world, but in the old map, I couldn't even do that.

And I downloaded both versions of "Brothers of Mercy and War". The first time, I played the unsuccessful version 1, and I wrote a review for the second one. The map is good, but everything is locked, and it's unclear where to go (the path to the mainland is blocked by a guard who requires a medal of valor, which I couldn't find; I also couldn't free the imprisoned hero, the pink Coronius (most likely, he has the medal), who has a good army, even though it's almost suicide; there's no magic, and the Grail just killed me).

Added 8 minutes later
I have one question, purely technical. I'm playing the Complete Collection, which originally had the old maps, in Russian and English, from Breath of Death and Armageddon's Blade. Then I started downloading and adding new ones. Due to the limit, most of the maps were not displayed, so I cleaned up and copied the old ones into a separate folder. The problem is this: I deleted all the old maps in Russian (from the time of Armageddon's Blade) from the folder, leaving only the English ones. I opened the game - but the maps in Russian reappeared. To check if I was loading the correct folder, I deleted all the game maps, opened the game - it was empty, with no maps except for the random ones. So everything is okay. I filled the folder with maps with English names again, opened the game - and the maps in Russian reappeared. How is this possible? Where did they come from if they are not in the folder? And how can I delete them? Because of them, I can't play the maps that are not displayed.