Even Quentin knew that using magic to alter one’s physical appearance never ended well. In the world of magical theory it was a dead spot: something … - Lev Grossman

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Even Quentin knew that using magic to alter one’s physical appearance never ended well. In the world of magical theory it was a dead spot: something about the inextricable, recursive connection between your face and who you were—your soul, for lack of a better word—made it hellishly difficult and fatally unpredictable.