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Probably (for children of Hermes) excess of anything. It'll make them do things that are over the top exaggerated. In Luke's case, an excess of anger against Hermes and the Olympians was his fatal flaw. Think about it- if he wasn't so angry, Kronos wouldn't be rising (maybe he would through his own power, but not through Luke), he wouldn't have died, and, well, you get the point.

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