Fidelias said:
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The Dresden Files, by Jim Butcher. But they'd probably screw it all up...
Could work... But I'd personally love to see the Codex Alera series made into games, if they got it right of course. The fury system of magic is pretty innovative and would allow for great character customization. Name your fury, allocate points into furies, specialize in one or be a jack of all trades...
I'm only on the 5th book right now, so I'm not sure how the series ends. But the game could take place before or after the books, or as another character during the books. I don't think you should play as Tavi since that could be too linear...
Perhaps the game could take place before the battle of First Calderon, leading up to it? I see it as being an Oblivion style game, but with more focus on magic (furies). It's such an impressive world... You could go on covert missions to the Cane homeland, fight the Snowbeasts with the Antillar forces, etc.
Hell, what if you played as Fidelias pre-Codex Alera? Now that would be cool. Nice name, by the way