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You can definitely win with any type of magic. Personally, in the first mission, they kept pushing Chaos magic on me. I stubbornly refused and eventually found Light magic. But when I was playing the second mission, I discovered that the spells in the Inferno castles were so cool. I agree 100% that arrows enchanted with Meteor Shower are awesome. With that, you can have a smaller army. The result: I'm replaying everything from the beginning. And I'm using Chaos, Light, and Wizardry. Let's hope for the best.