My name is Clyde Pie, and I've never heard of ponies checking into a hotel one by one and disappearing. It exists, and the fact that ponies are disappearing into it ain't the oddest thing about it. There's always room in Hilberts Hot
When Aryanne, Ponyville's resident Nazi sympathizer/unicorn supremacist (who is an earth pony), takes over as substitute teacher for Cheerilee's class, she discovers the ponies aren't quite as excited about eugenics as she is.
Nightmare Moon won a thousand years ago, plunging Equestria into perpetual night. Now, as Princess Luna's student, Twilight Sparkle must contend with Celestia's unexpected return as a familiar group of ponies are thrown into conflict.