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C&P From wiki character Summarys for Code Geass -

Once C.C.'s power reached its full potential, the nun passed her immortality onto C.C. Lelouch would have suffered the same fate, but she decides to spare him by having the Emperor kill her, claiming her wish was to die. Lelouch convinces her to live, but she loses her memory and [--->]immortality[<-----], reverting to her knowledge and personality as a peasant slave girl.