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I completed this map on Hero difficulty, playing as Inferno, and as the first player.
Walkthrough
The opponent was random, and an Orc appeared. There are no sawmills or mines near the city, so resources are scarce. The start is without a hero; Grog and Ravenna are in the tavern. I killed three squads; the remaining neutrals were too strong. At the beginning of the second week, I hired Daleb in the tavern, and I was finally able to start developing somehow. I decided to play without Fire Arrows and choose skills that would be more useful in a long game. On the seventh week, Shakarukat (medium difficulty) arrived, but he only killed Grog and ran away. Then, I gradually explored the map and advanced, although the neutrals were very unpleasant in the passages (druids, mages, forest archers). I reached level 20 and, for 25k, surrendered to some Orc to return home and learn the Portal spell to the city (as well as Berserk and Vampirism). There was constantly a shortage of ore; I only found a mine at the end of the third month. Shakarukat came again, and Daleb defeated him in the field (losses: 29 imps, 2 hellhounds, 3 devils; he fled). Then, I captured a neutral undead city and continued to develop Ravenna. Shakarukat came with high difficulty and attacked Daleb in the undead castle (killed with shackles; losses: 11 succubi, 2 cave demons). Soon, Nazir also attacked this castle, again with a large army of Orcs (where do they come from?) and, of course, a strong Chaos army; I won with a mixed army (losses: 8 cave demons, 37 vampires, 15 liches). After that, I dug up the Tear of Ash and went on the offensive; everything was easy after that. I won in 127 days. And it became clear why enemy heroes came with such large armies: the opponent had two Orc cities against my one Inferno city! As I understand it, the second city was random, and he was just lucky.
The demon start on Hero difficulty is very slow here; I was lucky that Daleb appeared, and I was able to develop normally, but without her... would I just have to skip turns? Despite this, I liked the map; it has a very beautiful design, and the idea of making a real stone dragon out of mountains and stones is interesting.

The game itself also turned out well.
Thank you very much for the map!