This story is a sequel to Rainbow Factory

Cloudsdale Weather Corporation has been running without incident for over twenty years. That is, until two foals manage to avoid being processed and find themselves in the haunted bowels of the massive facility. Can they make it out of the abandoned factory with their sanity intact? Will they uncover the secrets even a company as dark as the CWC is ashamed to keep? And what of the workers who help ensure that, in the end, not a single soul gets through...

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—[TVTropes Article]—[Plagen Shiki's Reading]—[The Song Inspired by the Story]—

Twilight decides to go out for a friendly night of drinking with her two friends, Pinkie Pie and Fluttershy, to relieve the stress of planning her brother's wedding and defending Canterlot against the changeling invasion, but not all is as it seems.

A letter arrives in the middle of the night, informing the unicorn that one of her two friends has been replaced by a changeling.

The Mane 6 are captured by Hugo Strange, and are sent into Arkham City. He separates them and steals the Elements of Harmony. He plans to use them for Protocol 10. They must find a way to get the Elements back, get reunited, and get back to Equestria.

This is a fan-written side story of what is happening in Batman: Arkham City. Its a story about the 6 main Ponies, not Batman. I first uploaded this story on my Deviantart on February 13, 2012. I'm just now putting it on here also.