Regulus Black, a Slytherin.
When 17-year-old Regulus opened his eyes, he found that the world had changed.
The Boy-Who-Lived defeated the Dark Lord.
The most important thing is that when he woke up in 12 Grimmauld Place, he found himself lying on the cold ground, and the Hogwarts owl sent him the fifth grade book list.
…
And when he followed Dumbledore to the cave where he was looking for the Dark Lord's Horcrux, there was a note in the Slytherin's locket.
He was very familiar with the handwriting on it, but the content made his whole body's blood flow instantly: "I am willing to die for you, and when I meet my destined opponent, I am just a mortal of flesh and blood. R. A. B."
…
This is not what he left.
So who?
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Ciel Espey, a Ravenclaw.
A transfer student from... Durmstrang?
A Hogwarts legend.
This of course does not refer to Transfiguration, which she always hovers around the passing line, but to History of Magic and Ancient Runes, which she always gets O's for, and maybe extra points for each Potions class.
There must be no one in the entire Hogwarts who hasn't copied her History of Magic homework.
Oh, except Hermione Granger.
An accident the day after tomorrow made her magic power unstable, causing her nose to bleed easily when casting spells? It doesn't matter, let her be the first liberal arts student at Hogwarts.
The experience left by predecessors in the history of magic, the ancient magic circle written in ancient magic script, plus magic potion?
…
A magical combination is born!
Intention: Man can conquer nature
