Gray Alliance

I completed it, and they gave me a Thunderlord. I don't think mission 5 is that difficult.
The campaign turned out to be very good!
The author did a great job!

Thank you for the walkthrough! By the way, I slightly buffed the boss just a few days ago. It's possible to give the Overlord a shield, but I was afraid of a bug in version 3.1, where the shield is rotated 90 degrees.