Legend Of The Dark Spirits

After meeting this spirit and it possessing her people didn't know what was happening to her.

They asked if she was alright and she said she was. She had to keep this a secret.

Everyday she felt more of her mind being washed in darkness, sadness and cold. She tried to keep control of the monster now living inside of her but she just couldn't.

With it being in her she couldn't even control herself. She was all stealthy that day and lit the Ponyville town hall on fire causing lots of damage. She now realized what the real threats to equestria is: herself.

Every crime was worse then the last. Luna knew it was only a matter of time before she assassinated Princess Celestia.

She had a nightmare one night of instead of saying her real name she said her name was: nightmare moon and eventually the dark spirit DID start saying Luna's name was now nightmare moon.

People started to fear her, thinking she was like those other evil ponys who were framed by these monsters. though nopony even knew about these horrible cruel monsters living in the pony mind.

She could feel herself slipping. Everyday she lost more control of herself.

There is only one pony in the world besides the ponys controlled by these monsters who know about dark spirits.  that Pony is Celestia. She read a book on mythical creatures.

After a while Celestia thought she knew what was happening to Luna, but decided to wait for more proof.