Rarity, who has lived in Ponyville the longest out of all the Element-Bearers, tells them the tale of the three legendary figures that rise on Nightmare Night. Twilight Sparkle imagines that there may be a magically-natural explanation for the consistent sightings on a particular night. She proposes they investigate this. And in the process uncovers shocking secrets long buried and seemingly meant to be consigned to the mists of history. And between the mystery, the real story of a doomed romance, two figures coming together centuries before they should even have been mutually aware of one another.
Happy Nightmare Night and Happy Halloween all!
(A note on the title: It's two things. First of all, I am Hispanic and from Southern California, so it's in my cultural wheelhouse. The iconography and feel appeal to me. Secondly, the cover image inspired the story, in the main, and I thank Bronystories for sending it to me. The story is not, itself, a Hispanic tale.)