Level 7 is more than enough like everyone said.
Alexander got to play once before it was my turn. He did little something. Then it was my pyromancers turn, who basicaly obliterated Alexander, his gheist and one more magister in single turn. My warrior finished another magister and it was only the rogue left i think. Then worm spawned and killed the rogue. I broke the worms armour using one normal hit and overpower. Then my ranger got to play. Flesh sacrifice, rage, sneak, and hit with snipe for over 1000k. Then the worm did some damage, almost killed one of my guys, but i finished it off next turn.
