"Never forget, though, that one of the most famous Patronuses of all time was a lowly mouse, which belonged to a legendary young wizard called Illyius, who used it to hold off an attack from an army of Dementors single-handedly." Harry Potter is my childhood and I loved reading every snippet on Pottermore. This book really brought me back to my childhood. There are explanations of various aspects of the wizarding world, character backstories, fun anecdotes that never made it in the books, and a peek behind the curtain at how JK Rowling arrived at some of her ideas. Even though I don't support JKR anymore the level of detail in the world she created is amazing.