Alchemy professor at Hogwarts

One of the greatest alchemists, Hardy Ollivander
Before graduation, he was "School Rule Destroyer", "Friend of Fantastic Beasts", "Snape's Lifelong Enemy", and "Azkaban Advanced Student"!
After graduation, he returned to school as a professor of alchemy!
The continuous explosion of the platform, the dream loop covering the whole school, the successive disappearances of orthodox wizards and the serial crimes of Catwoman Keira...
Hardy said that he just wanted to teach alchemy quietly (helplessly)
PS1: Teaching Alchemy Creation
PS2: Timeline Part Two Chamber of Secrets

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