"Flight to Salvation" - "The Veil is Torn" [Campaign 4, Mission 2]

Be sure to check the hero's skill tree: see in what order the necessary skills appear. (The skill and ability wheel is on the disc with Tribes of the East). You can also find a mod to improve it on the forum. When I was leveling up Zehir, the necessary skills didn't appear right away, so I had to reset and try again and again. I spent about 100,000 on leveling up.
Yes, and one more thing: a berserker with the "subjugation" skill is a dark magic class.