Rainbow Dash encounters a spooky castle and learns something.

This story references an episode from the series (guess) and the arguably pretty good chapter book Starlight Glimmer and The Secret Suite, fully explained in the text with a minimum of spoilers. Any references to the Potterverse is the fault of that author, not yours truly.

This story was written for the WriteOff.Me The Twilight Zone prompt and slightly expanded here with suggestions taken from the critiques. Thank you everypony who pointed stuff out! You can read the original here. This version is both 20% cooler and 20% longer!