Twilight Sparkle and friends are on vacation in the Crystal Empire, but when the rain traps them all inside, they find other ways to occupy themselves. When Cadence suggests a friendly ritual for protection, everything seems to be in good fun... until the earthquakes begin, the ponies are separated, and they're hunted by the dark spirits that lurk within the closed spaces inside of the Crystal Palace. Who created this place, and can any pony make it out alive?

Based on the video game "Corpse Party" by Team GrisGris.