After Twilight goes into an unexplainable state of hysterics, Starlight, on a mission to help save her friend discovers a spell which may save Twilight but also brings with it a horrid fate to anypony who casts it.
A submission for RockstarRaccoon's Nightmare Night in April: Horror Write Off
https://www.fimfiction.net/group/214288/the-cult-of-raccoon/thread/398722/nightmare-night-in-april-horror-write-off