In Transylvania (which is an excellent start to any story), there is a legend about a school of black magic run by Satan, called The Scholomance.
That sentence alone raises SO MANY QUESTIONS:
1.) Is it a state-run or private school?
2.) Is Satan the sole teacher, headmaster, or just the founder? If either of the latter, whom does he employ? That's got to be an amazing job interview process.
3.) What's the tuition like?
4.) Who attends this school? Local children? Wizards? IS THIS A SINISTER HOGWARTS?
Side note–Shit, you guys, Voldemort totally spends time in Romania in Harry Potter. Is this really his school? Or did he maybe just attend to brush up on his evil skills? Like community college for dark wizards?
Emily Gerard, who was a 19th-century author, traveled to Transylvania and published a collection of folktales, this being among them. Her collection famously had influence on Bram Stoker in his composition of Dracula.
Gerard writes, "As I am on the subject of thunderstorms, I may as well here mention the Scholomance, or school supposed to exist somewhere in the heart of the mountains, and where all the secrets of nature, the language of animals, and all imaginable magic spells and charms are taught by the devil in person [ah, well that answers that question. That's a LOT of responsibility. I'm teaching 4 classes this semester and it's wearing me out. I can't imagine also being the Prince of Darkness. Sounds like it's a position with a lot of paperwork].
"Only ten scholars are admitted at a time, and when the course of learning has expired and nine of them are released to return to their homes, the tenth scholar is detained by the devil as payment, and mounted upon an zmeju (dragon) he becomes henceforward the devil's aide-de-camp, and assists him in 'making the weather,' that is, in preparing thunderbolts. A small lake, immeasurably deep, lying high up among the mountains south of Sibiu [sic], is supposed to be the cauldron where is brewed the thunder, and in fair weather the dragon sleeps beneath the waters."
Ahh, so this explains the tuition: perpetual servitude. If I'm being honest (and checking my bank account), this sounds pretty standard.
Someone, go read Dracula and get me any and all references to this text!