21) What spell created by the Half-Blood Prince is used to levitate Watermelons?
22) What object does the Half-Blood Prince use to store his memories?
23) Who discovers the potions book belonging to the Half-Blood Prince?
24) What Dark creature does Severus Snape summon in the sixth book?
25) What is the name of the potion created by the Half-Blood Prince for Felix Felicis?