Gunslinger
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I completely forgot about the heroine, Eruin (or Irbet, I think), with a special ability called "Dark Empowerment" (or something similar), which gives her a chance to deal additional damage to Dungeon creatures after using Chaos magic. She also has cool starting abilities, and her starting location is decent (she has Lightning Bolt). At a high level, Dungeon creatures almost always support the hero's magical attacks with their own shots. Overall, she's a great hero... except when it comes to the campaign.