After transmigrating to another world, I obtained the Holy Grail System, which connects to countless worlds. Starting as the headmaster of Hogwarts,
I have four great wizarding schools and a million wizards. Who dares oppose me!
I have countless instructors: Merlin, Dumbledore, Grindelwald, Gu Yi, Medivh, Jaina, Gandalf, Marlene, and the White Queen, all taking the field together!
Only arcane magic is eternal. Dragons, demons, even gods: I'll turn them all into specimens and put them on display as teaching materials!
This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.
Let's make a separate volume for settings.