Princess Celestia has a nightmare of her faithful student dying in a horrible attack that destroys most of Ponyville.
What is worse, though - is her response within the nightmare.

This story is an indirect prequel to my other story: An Old Guardspony'sLast Duty.
http://www.fimfiction.net/story/13398/An-Old-Guardspony%E2%80%99s-Last-Duty

I wrote it as a separate story because mixing too much [Dark] into [Normal] stories is frowned upon – and I wanted to describe a nightmare that is vividly bad enough to make Celestia want to do something about it.

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Many Thanks to my Moony Maiden - you know who you are! Your editing prowess has made this work at LEAST 20% cooler.

(As always - MLP:FiM belongs to Hasbro. They own the world - I only play in it.)
Picture used under Creative Commons License (http://www.flickr.com/photos/patrickgensel/7003567267/in/photostream/)