Durmstrang's true 'claim to fame' or rather 'notorious hallmark' was one of its former pupils: Gellert Grindelwald. Grindelwald permanently stained the school's reputation by pushing the boundaries of dark magic even FURTHER than the school permitted, eventually being expelled for 'twisted, dark experiments' and 'near-fatal attacks' on students.

But what exactly did Gellert Grindelwald do? Durmstrang was notorious for allowing its students to explore the darker side of magic..How far did he really push that boundary?

As these attacks and experiments were never explored in detail, today I'm going to be taking a look at a few theories.

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