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In my opinion, it’s quite difficult to level up a Warlock effectively. The main thing is to take Chaos Magic, and everything else isn’t that important. Personally, I played through this campaign twice; the first time, I didn’t even know about the Skill Wheel. As a result, I didn’t take Luck, and I didn’t have Arcane Luck. Nevertheless, I completed it without any problems. The second time, I played on a higher difficulty level (the second-highest), and I took Luck, but I didn’t take Summoning Magic; again, I didn’t experience any particular difficulties in any of the missions.