Магичен Теория (English: Magical Theory) was a spellbook that was part of the required books at Durmstrang Institute. As such, when Durmstrang students went to Hogwarts School of Witchcraft and Wizardry in the 1994-1995 school year for the Triwizard Tournament, they could be seen carrying their copies of this book.
Behind the scenes
- The English translation of the Bulgarian title of this book is Magical Theory, which is the title of a required book at Hogwarts School of Witchcraft and Wizardry. It is possible that Магичен Теория is the a Bulgarian translation, and thus the same book, as Magical Theory.