"Escape to Salvation" - "Magnificent Retreat" [Campaign 4, Mission 4]

I'm not just a Berserk, but I also couldn't cast the "Subjugate" spell on level 7 units. I cast it on level 6 units standing next to the Demonesses. I used the counterspell for the first time. I didn't even know how it worked. Turns out, it's a great thing to have if you have a lot of mana. It can be learned by both Necromancers and other classes.