Talk:Princess Luna/@comment-27320592-20160204070414/@comment-27161581-20160205021434

It is left ambiguous, however since there was the prophesy in Twilight's book, the magic Celestia used to banish her might have had an end condition that was written down. The nice things about this ambiguity is it allows many different interpretations, without bogging the viewers down it the technical aspects of magic.