The Essential Defence Against the Dark Arts,[1] also known simply as Defence Against the Dark Arts,[3] was a book on combating the Dark Arts, written by Arsenius Jigger sometime before 1993. It was published by Luca Books.[1] It was used by Professor Lupin as a required textbook for his third-year Defence Against the Dark Arts.[1] This book was caught up in the Calamity in the 2010s, with a copy of this book being returned to the witch Zelda Hum after it became a Foundable.[4] This book had…