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Yesterday, after three days of struggling, I finally completed this mission. I'll describe it in a bit of detail, in case it helps someone. :)\
Before this, after reading a lot of advice, I tried several times in the first week, but it didn't work out well – if I somehow managed to win the battle against the mages, then in the second wave I hardly had any army left, and it was disappointing. Eventually, I gave up and decided to prepare more thoroughly for the battle. :)\
In the city, on the very first day, I hired a second Necromancer hero and transferred the entire army of Isabel to him. Isabel herself, with a small number of zombies, was placed in the city. When the cutscene about the departure of the angels appeared, they actually remained in the army of the hired hero. I'll say right away that it's better not to leave any creatures of Order with Isabel, because when I bought creatures and left them in the city with Isabel, a decent number of monks managed to leave me. :(\
So, with the hired hero, we transport the army of Order to the Necropolis city and transform them into undead there. I converted almost all the creatures, but I left archers/crossbowmen (in battle, archers are more important than zombies, at least for me). It's very useful to transform various lower creatures into Bone Warriors and then upgrade them to Bone Archers. Of course, all the converted creatures need to be upgraded. In the Necropolis Castle, be sure to build upgraded dwellings for each creature. I didn't upgrade only the Zombie dwelling, because they are not needed in battle anyway. In the Order Castle, I only had creature dwellings up to Monks (nothing was upgraded), buildings for defense/growth, and for money.\
We travel with Markal, collect artifacts, and build up our army. In battles on the main island, I tried not to get involved. I didn't take Godric's daughter out of the dungeon until I had a sufficient army. The lower part of the map remained closed; I sailed to several upper islands (on the map above the Order city), collected several artifacts, increased stats, etc. The Initiative stat is very important; try to increase it and don't spare money on a good Initiative artifact in the green tent (if there is one).\
Several times, the orange player attacked me, but nothing critical happened; the army was easily replenished. :) I didn't build any dragons; I didn't have enough resources. I naturally preferred mages, flying creatures, and archers. Death Harbingers were also very useful; I had about 20 of them. I just placed them at the castle gates, and if any of the enemies wanted to come out, they immediately got a scythe to the neck. :) In total, my army consisted of 2 Angels from Isabel, several dozen Crossbowmen from her, about five hundred Bone Archers, Ghosts, Higher Vampires, and Archliches.\
A few days before the end of the week (I don't remember which one, but at the beginning of the next week, a window appeared saying that the amulet was needed within a month), I went to get Godric's daughter and went back to the Necropolis. On the way, angels attacked; I took the wings. Without killing the army of orange Paladins, I flew to the mage's hut, which gives a view of Godric's castle – if there is no view, you can't fly to it. I took the army from the Necropolis and flew to capture Hikam; the danger from Godric was low, which surprised me. :)\
In the battle, I used Subdue on the Rakshasa Princess, but first, I killed the Djinns or made sure that it was still a long way to their turn. Some of the spells disappeared for some reason, including summoning elementals, blinding, and many other useful spells. :( I periodically healed my creatures; at the very beginning of the battle, Markal also performed mass attacks: ice/fire ring, etc. I didn't have any phoenixes or anything, but I still successfully completed the mission. :smile13: