Setting: Sources for the Canon World's Settings

More than twenty years have passed since the first Harry Potter novel was published. Over the years, films, fanworks, video games, and merchandise had emerged one after another, constructing a dazzling world. However, many of these different products contained conflicting fictional settings; the films, for instance, made many changes for the sake of the plot.

The canon world of this book was built upon the seven original Harry Potter novels, with the addition of certain official settings acknowledged by Rowling herself. These settings came from:

- Pottermore's official website (now renamed Wizarding World)

- Rowling's official website (Wizard of the Month came from here)

- Rowling's personal Twitter account

- Rowling's interview content on talk shows (the most important being the sections "Original Forty" and "Mystery of Harry Potter's Immortality")

- The Fantastic Beasts and Where to Find Them film series (only the first two films had been released when this book was begun)

- Of the Chocolate Frog Famous Wizard Cards, only the original 102 cards created by Rowling herself were recognized (the 25 cards added by the video game Harry Potter and the Prisoner of Azkaban were not recognized as official settings)

- The video game Book of Spells (the content was written by Rowling herself)

- The video game Book of Potions (the content was written by Rowling herself)

- Fantastic Beasts and Where to Find Them, written by Rowling

- Quidditch Through the Ages, written by Rowling

- Black Family Tree, written by Rowling

- Lestrange Family Tree, created by MinaLima and officially authorized

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The settings in the following works were not accepted by the author:

- The Harry Potter films (many of their contents and settings did not match the novels)

- Video games (other than Book of Spells and Book of Potions)

- The novel Cursed Child (see note below*)

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Note*: Cursed Child was written by Jack Thorne. Although it was reviewed and acknowledged by Rowling, the characters' behavior in it was simply too strange. A Voldemort who considered himself immortal and had conquered death actually fathering a child with a female subordinate was utterly baffling.

Time travel was also a major pitfall. The original novels mentioned that if a Time-Turner took someone back more than five hours, it would cause irreversible harm to the human body—as could be seen in Pottermore's description of the Time-Turner: in 1899, Eloise Mintumble used a Time-Turner in an experiment to travel back in time, but died because the time span exceeded five hours. During the experiment, Eloise was trapped in 1402 for five full days. When she returned to the present, her body had aged by five centuries and suffered irreparable damage, eventually leading to her death.

Rowling also mentioned in an interview that although she believed Hermione and Ron would marry, their marriage would not be happy and would most likely end in divorce. (Ron was modeled after Rowling's ex-husband, while Hermione represented Rowling herself.)