Souring NightmareThe creature that never sleeps. The night that sours through the sky. The
 
nightmare that never ends.  
Souring Nightmare, the evil doppelgnger to Fluttershy, this being sours through the sky to seek sleeping ponies that wish to dream.  
Her job in the land of Apocalypse is to give every pony nightmares that, no matter how many nights, never end.  
Silent as the night, she slips through the skies like a shadow. This is because her body is made of pure fear and swallowed dreams.  
May you never see her shadow souring over head, or you’ll be next to see her in your dreams!