If it doesn't come for years, you just have to wait. You get the idea. Professor Slughorn quit Hogwarts after Voldemort attacked Harry when he was a baby. "Short Stories from Hogwarts: Power ...

When Professor Slughorn came to teach at Hogwarts, he mentioned countless times what a prodigy Lily was at Potions. When Harry was using the Half-Blood Prince's book to craft impressive brews ...

During Harry Potter's sixth year at Hogwarts, he finds a book that once belonged to the mysterious Half-Blood Prince that earns him the respect of his new Potions professor Horace Slughorn.

During Harry Potter's sixth year at Hogwarts, he finds a book that once belonged to the mysterious Half-Blood Prince that earns him the respect of his new Potions professor Horace Slughorn.