Slughorn moved to have them begin their lesson before Ernie Macmillan asked about the small black cauldron on the Professor’s desk. Hermione hadn’t had a chance to see it, but as Slughorn gave a chuffed laugh, he turned to it and said, "Well, that one, ladies and gentlemen, is a most curious little potion called Felix Felicis." Hermione gasped as all of her attention turned to it. It was one of the most challenging potions to make. "I take it that you know what Felix Felicis does, Miss Granger?" 