Hermione Granger

"I became... concerned at my arrogance. I believed my work was a serious danger to the very fabric of our universes. I can't recall all the details leading up to the decision, but eventually, I consented to having certain portions of my brain removed. After the procedure, my mind, as one would expect, wasn't as sharp as it had once been. Unfortunately, my instability caused the death of one of my lab assistants. So, my stay at St. Claire's was court ordered," Walter admitted, "I suppose that isn't a shining endorsement for working under my tutelage.