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Huge respect to the author! This is a wonderful map; it really made my business trip more enjoyable (especially the evenings and weekends).
The idea with the angel wings is simply amazing!
Here's a brief battle report:
I played as my favorite hero and race – Letus, a Dark Elf. For the first month and a half, I fought neutral creatures on my territory, leveling up my main hero to around level 20. I maxed out his logistics, dark magic, and chaos skills. After that, I infiltrated the lower levels without any losses, using the invisibility of my Griffins and harmful magic to destroy the lower opponent. I got lucky that he was also a Dark Elf.
Then, with an army of seven Griffins, I broke through one of the outposts guarded by hordes of Titans and other creatures from the Silver Cities on the second try and easily entered the lower central portal, defeating its guards.
The most challenging battle was against a hundred and a half Phoenixes. Because of their high initiative, the Griffins couldn't hide, and plague didn't affect them on the first try – they resurrect after the battle until they are completely killed.
Because of this, I had to attack them four times and lose about 40 Griffins.
But then, after capturing the angel wings, destroying the enemies became a matter of time. I considered taking the second set of wings and equipping them on my second hero (the former main warrior of my lower enemy), but then I decided it would be a waste of time. I gave this warrior all the available army except for the Griffins and prepared him to guard the borders in case the enemy broke through (as it turned out later, it was unnecessary – none of the neighbors even tried to attack the Titan outposts). As a result, after capturing the wings, I, with Letus and a hundred Griffins, went to fight the enemies directly, bypassing the strong outposts.
In one sector, there were representatives of the Silver Cities, and below them – demons. By the time I arrived, the demons had already defeated the mages, but they hadn't accumulated enough strength, which made my task much easier.
While I was fighting the demons in the last sector, the Dwarves, who lived in the Dungeon, strangled the Undead who lived above them. I captured the Undead cities with the Griffins I had, and then I returned to my city, where I gathered all the troops I had at my disposal at that time, and went to finish off the Dwarves – they didn't put up much resistance.
The campaign ended at the beginning of the fourth month – Letus reached level 34.
I have a few recordings of the battles I enjoyed; if anyone is interested, I can upload them.