Half-Blood Prince's potions book

Overview
The Half-Blood Prince's potion book was a book that belonged to Severus Snape in the 1970's he made many edits to it as the instructions were changed. In the 1996-1997 school year for Hogwarts Harry Potter came across the book as it was in Professor Slughorn's cabinet. He did better in potions that way, and Hermionie Granger thought the "Prince" was a dark arts enthusiast. A spell in that book Harry came across was Levicorpus a spell that lifts people up by there ankle. He also came across Sectumsempra a very dark spell that cause gashes to appear along ones body with the wand movements. After 1996-1997 the book hasn't been seen.

Behind the Scenes

 * Harry's dad James Potter used Levicorpus on Snape in a pensieve memorie.
 * The spell Sectumsempra was used on Draco Malfoy and got Harry detentions till the end of term.