From the Story

Harry Potter and the Half-Blood Prince

Discovered in chapter 9, The Half-Blood Prince

Professor Slughorn lends Harry an old copy of Advanced Potion-Making for his Potions lesson. The book's previous owner, the self-titled Half-Blood Prince, scribbled all over the pages, so that the margins are as black as the printed portions. The annotations include advice on how to improve the potion-making process for various potions.

Discovered in chapter 24, Sectumsempra

The incantation of the curse Sectumsempra, which was invented by the Half-Blood Prince, was written in their copy of Advanced Potion Making.

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