This story is a sequel to The Magic Of Mermaids

During that time of the mouth, The Rainbooms celebrate by watching horror movies while wearing costumes at Sunset’s place. But then they come up with a great idea to make one of their favorite movies come true, at Equestria Land! They want the final day of the month to be a night full of horror but also excitement with tons of their friends coming over.

But once Sunset’s friends and Vignette took care of redesigning in the theme park before nightfall, Equestrian Magic appeared and around that time during Equestria, Nightmare Night is celebrating while the offspring of Tantabus’s Magic transformed the entire park, including everyone who’s there.

Thanks to Daniyel099 for editing this.
https://www.fimfiction.net/user/292246/Daniyel099