Charlemagne is a guardian who went mad and joined the cabal. He might have turned himself into a war mind though. Not sure.
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How do you know that? I always assumed because of Charlemange's vault and Seraphim vault, Charlemange was also considered a warmind. But now I realise Rasputin is in the seraphim vault so it kind of doesn't make sense :P Also warminds are advanced AI's so I doubt a guardian could become an AI.