Twilight Sparkle and the rest of her friends have decided to go on an exciting outing for Nightmare Night: go investigate the haunted castle of the royal pony sisters, Celestia and Luna. However, while they expected Pinkie Pie to pull pranks again and for Fluttershy to be scared out of her wits, they get something much worse.

Fluttershy warned them. Or at least, she tried to. Because she knows about the three fillies who went into the castle, and never came back out...

Can she save her friends from meeting the same fate?

This is a crossover with Nox Arcana's Darklore Manor album and stories.