this is my version of something that happend a long time ago ...
NIGHTMARE MOON
A thousand years ago in equestria lived two sisters whoem of witch are usually are happy but there parents just died not so long ago they have been fighting night after night until one day celestia got mad ather little sister and threw her against the wall.Luna got up powding and running into her room she had felt pain julting threw her body and started to get angrier that each tear drop that fell on her cheek.She felt more angry and walked out of the room hearing voices comeing from downstairs as she slowly walked down the stairs as the voices got louder and louder each step. When she came downstairs she watched as her sister walked towarde the belconey and there was a loud roar but when her sister lefted she ran and poped up on the belcony nopony said anything they just were talking to each other then that night when was raising the moon some thing hit her when the moon was up luna crashed down to the earth when she got up her eyes were different and celestia watched in horror her sister smiled evilly as she transformed into NIGHTMARE MOON when she was done transforming celestia said"sister..." Luna/Nightmare Moon said"yoursister is locked away in eternel darkness if you want her back let me rule all of equestria" ."fine" celestia said with a sigh.
She flew of and without warning came down like a bullet and used her majic to attack celestia she used her majic and celestia came sliding against the floor her crown falling off and hit something behind her without thinking she grabbed what was called the elements of harmony and banished her younger sister to the moon feeling guilty she ranhome passing everypony that needed to talk to her she ran into the castle crying her head off .The next thousand years she spent alone until nightmare moon came backand she sent her student twighlite to get rid of nightmare moon untill she was trapped in a huGE maze...
THIS WAS JUST THE WAY I IMAGINED IT NOTHEING TO DO WITH HASBRO.