Talk:Princess Celestia/@comment-5217318-20130402015323/@comment-26973802-20130406231447

Faust said Luna couldn't be drawn out of Nightmare Moon at the time (I think because Celestia and Luna together wielded the Elements of Harmony to defeat Discord, Celestia alone would possess only half their power) so she had to seal Nightmare Moon away for a thousand years and orchestrate the events that led to Luna's release. Only when somepony else became connected to them could Nightmare Moon be turned back into Luna by their full power