The “In Search of Power” scenario.

I almost completed it. I cleared out all the enemies, but I didn't fully explore how to open the gates. I started getting less experience, so I gave up on that scenario. They also fight among themselves there. So, the main thing is not to leave the city unguarded. First, I defeated the Knights, and then the Elves and Mages broke free. As a result, the Elves overwhelmed the main hero of the Mages, and it was easy to finish them all off.