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I managed to complete it after several attempts, playing as the Hero, with the HOF Renegades mod.
Vittorio is difficult to defeat. But, as I understand it, many things, including the AI's behavior (even who it will target first), depend on the initial troop placement. The arena had some logs. I placed archers there, protected by a few armored units. I lured the griffons out to draw the paladins, and then the zealots, onto the mines.
I immediately maxed out Waren's Luck skill (bringing it up to the "Luck of the Road and Spoils" level). This made building the castle much easier.
And I developed combat machines (Catapult, Ballista). The combat machine market kind of hints that they are needed. They are perfect against neutrals.
Attack with ranged units, and of course, logistics. (Without logistics, you can't do much here. In war, speed is life, and life is speed. In this sense, demon scouts + the Path of War are very helpful.)
And, of course, an experienced commander. Archers are our everything.
I didn't have any particular problems with Myv.
As soon as Darkness became available, I took it, and in combination with Mass Dispel, I successfully defended against Dugald. If he came with too large an army, I met him in the castle.
Underground passages complicate things (which is good from a gameplay perspective) because enemy heroes emerge from them at the most unexpected moment.
I finished off the turquoise hero towards the end of the fourth month, or rather, at the beginning of its fourth week, then went to look for obelisks, explored the caves, killing everything that moves, or tries to move. I visited the mentor, took Education, and went to defeat the gnomes, towards the end of the 7th month.
I defeated them, although I lost almost all of my paladins (Divine Retribution is a terrible thing). Vampirism, combined with Mass Dispel, helped me win. The paladins and adepts saved me from the enemy's dark magic. You attack your subordinate unit with adepts, and they are very likely to cleanse it.
Fleeing from Groll, we ended up with the elf. And here, I simply didn't have enough of an army. After the gnome "affectionately" battered it, and there was almost no time left for the last reinforcement gathering... I had to replay, starting from the moment I attacked the gnome. I gathered reinforcements from all the castles and reworked Waren, focusing on defense and magic, abandoning logistics and attack.
I besieged Hottabych for a week and a half so that Magic would finally become available. Perhaps it would be good to add the ability to learn it on the map. It's a very useful skill.
In the battle with the gnome this time, I used Berserk a lot. I still suffered from Divine Retribution, lost 90 Fallen Angels, and all the archers. But I saved about 400 of Isabelle's knights, and they, being vampirized, finished off the elf.
Towards the end of the battle, the elf started using Divine Retribution, but the number of Isabelle's knights turned into quality.
Overall, I really enjoyed the map; thank you very much to the author.
Suggestions:
1) I would like to see more events after the death of the turquoise hero or the prophet druid. For example, the appearance of demonic heroes who would destroy cities when entering them would add more dynamics to the game.
2) Allow the ability to learn magic. Perhaps not at the beginning of the game. It is needed by both Waren and Cassandra.
3) Slightly reduce the elf's army growth depending on the time. Otherwise, the army that was beaten by the gnome is not enough.