It is a companion to the Harry Potter series and serves as a follow-up to the Wonderbook's debut title, Book of Spells (2012).

[1] Approximately 500 years after his death, a Hogwarts student somehow comes into possession of the Book of Potions, finding that some of Zygmunt's personality lives on within its pages.

Zygmunt initially comes off as warped and slightly mad, thinking of little but the Golden Cauldron, but, as the student's potioneering skills improve, he finds himself warming to them, eventually revealing exactly why he left Hogwarts: as a student, Zygmunt asked the headmaster if he could enter the Wizarding Schools Potions Championship despite being three years below the minimum age for entry, but he was denied, being told that it was too dangerous.

Unable to accept this, Zygmunt immediately left the school in protest, which disabled him from entering the Championship even once he had come of age.

Once the student wins the golden cauldron, Zygmunt's spirit finds itself at peace, and he congratulates them wholeheartedly for both obtaining it and brewing the Potion of All Potential.