Battle of the Celestial Gates

Yeah, on a hero. The first time, I also defeated the first demon.
I took out another one http://c2n.me/48h2dNg, at least it freed up a slot that the Goblins were occupying :) The guys came in handy, but after the next demon, they wiped out all the horses again, and I feel bad for the Squires, they're special units. I fought in this setup https://c2n.me/48h2HMj. The demon cast Vampirism on its own units, but there was a battle for initiative at the start, so I had to go without Sandro's cloak. Archangels, Seraphs, or Archers will replace the Goblin slot. I managed to make one sortie, with 14 peasants, I destroyed its Ballista and killed one Archdemon, losing a Ballista is also good.

Regarding capturing, I don't think you should rely on reinforcements at all. Well, dwellings help, yes, and replenish the army, but demons take back some dwellings and garrisons from time to time. None of my reinforcements made it through the outer garrisons, even though I destroyed a couple.

I still have some troops. A new week has started, so I have 27 Archangels + 69 Vampires + 26 Paladins + 186 Blue Archers + 371 Squires (there seems to be some kind of glitch, all the Squires are still there - I lost them in battle, there were only 10 left, but now there are 371, as if I didn't lose any). I have 524 peasants, 110 Griffins, I can get another 300 Obsidian Gargoyles and 74 Djinns, and 350 useless Golems and 24 Rakshasas, so I think I can defend myself. And there's a very strange thing with the Squires, because they all survived, even though I lost some in battle, as well as some Mages and Titans and 300 Fairies. The Orc gathered a small army, and I should also go and collect his 6 Dwellers with Railag.

The Mage is level 31, the General is level 32, all the heroes are level 25-27 (those who haven't been exchanged are level 25) on the map there are only 3 trees + maybe at the bottom, there the army is not strong enough for the Necropolis to clear everything.

I really like the idea. It's clear that everything is well thought out. It's like a tactical defense of the castle, where you need to use every opportunity to prevent you from being defeated. From the start, there are many options, where to go, what to capture, etc. You need to carefully prioritize.
For me, the map turned out to be too difficult, even on a Warrior. I couldn't survive the first attack. But, to be fair, I didn't capture many dwellings behind the inner garrison, and I didn't develop Cain. I'll try again, vasik seems to be carrying it on a hero) I'll try to act in a similar way. Judging by his description, there will be even more horror ahead.

P.S. Thank you for the opportunity to play with old favorite heroes again)