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A very peculiar mission. The first major setback occurred after a battle with the red Delebs, when my Zehir was left with only 3 golems. Up until that point, everything was going smoothly.
It's a pity to have to give away 10,000 experience points per week and 35,000 for the Castle, but I didn't really have a choice after that. I wonder, is it possible not to establish a Castle, or how? Those who join Zehir along the way are insignificant for the mission's objectives.
I searched everywhere for the required heroines, and it turns out they are in the far corner of the dungeon, while I was looking for a typical prison building.
The next two red heroes were defeated without any major problems.
On the 9th month, a UFO appears. And it clearly returns after a week from wherever it came from, back to Zehir's mobile Castle, and brings 4 Titans, or rather, Thunderbirds. Moreover, its level is listed as 1, but for some reason, its stats are not much different from Zehir's level 30. Seeing this, I had the idea to send it to Biaara first, giving it a book of Dark Magic for good measure. The main task was to eliminate her deadly ballista, but it turns out it regenerates after the battle. In general, it killed the ballista, inflicted some damage on her army, but not much more. Then, in the same turn, Zehir attacked her (Danger - medium at that moment, having 93 dragons and cyclops).
However, Biaara's main weakness is that she cannot remove the Mind Control spell from her units, and that was very pleasing. Also, for melee units like cyclops, you need to cast Vampirism in time, and for Titans, you need to cast Phantom. Zehir's Banishment also helps, as she summons quite a few units. After the battle, cyclops and something else remained, but it was no longer important.
P.S. I just turned on autobattle for all the "allied" battles and watched, because I didn't know that if one of them is defeated, it would be game over, as I read at the beginning. They all passed normally, Gotai with his 900 cyclops didn't even fight, Duncan didn't either. Wulfsten suffered the most losses. And yes, you can't take troops from allies - Zehir won't let you go underground, a message appears saying something like "I don't want to interfere with the allies."
And here is the infamous "Plate," if anyone hasn't seen it yet.