↑ Harry Potter and the Deathly Hallows, Chapter 31 (The Battle of Hogwarts) ↑ Harry Potter: Hogwarts Mystery, Year 6, Chapter 13 (On the Run) - Defence Against the Dark Arts Lesson "Sea Urchin Jinx" ↑ Harry Potter: Hogwarts Mystery, Year 1, Chapter 2 (Welcome to Hogwarts) - ...