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. | ” |