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The Summoning magic spells are a great help to everyone. The Wall of Swords and Phoenix make life much easier. After all, if you're not playing as Chaos, you don't even need to build fire enhancements. I saved resources to build level 7 creatures faster, rather than magic schools as required by the quest.
Knowing the map, I tried to reach the top as quickly as possible, fulfilling the necessary conditions...
On the surface, I also encountered the Imperials at a fast pace, not in cities in defense, but in the field near their garrisons! Then there's time to collect enhancements, Temples, and Mentors if needed...
I even managed to switch defense zones with the Necromancer to collect all the spells and enhancements for both.
The priority was on defense!
When the Imperials brought green troops into battle, I had to use the third type of "possessed" creatures. Luckily, I had a lot of them.
I used the Elven Castle army against their Leader once, but the rest of the troops were in reserve...
For the Necromancer, only ghosts and vampires decided the battles, and of course, Nosferatu. Only for the last battle did I go back to the Castle and deploy everyone, including the dragons...
Good luck and patience to everyone in completing the game!!!