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I'm currently playing on a difficult level as a Barbarian, and after reading comments about walkthroughs with "lossless" battles, I'm surprised and envious, as I can't imagine how it's possible to complete almost all battles without losses if you don't have Vampires or Paladins "in your squad" and they are "not available for purchase" anywhere. Besides, one Fire Storm or Geyser spell, and you're bound to have "losses"!