The Background Professor at Hogwarts

After being reborn and transmigrating, I spent eighteen years thinking this was just ordinary life. Then my golden finger awakened, and I discovered I was in the Harry Potter universe.

Aisen resolved to be an unremarkable professor at Hogwarts. But his golden finger turned out to be surprisingly powerful: he could extract and replicate supernatural traits from magical artifacts.

So Aisen extracted the ability to cast spells from a wand.

He extracted immortality from the Philosopher's Stone.

Aisen had planned to live an ordinary life in the wizarding world, until he extracted the ability to travel through time from a Time-Turner and made his first journey through time...