Harry Potter and the Prisoner of Azkaban attacked by a big black dog, which Harry has seen several times before. The dog drags Ron through a tunnel under the Whomping Willow into the Shrieking Shack. Harry and Hermione follow, and there is a brief standoff when they find Ron with Sirius Black, who has transformed from the dog. Lupin enters, and they explain the situation to Harry and his friends: Lupin is a werewolf, which led to his friends James Potter, Sirius Black, and Peter Pettigrew becoming animagi. Lupin explains that Scabbers is Pettigrew in his animal form; he has been hiding from Black, whom he had
Magic in Harry Potter Death Eater Alecto Carrow teaches Muggle Studies. However, her lessons (which are made compulsory) mainly describe muggles and muggle-borns as subhuman and worthy of persecution. Alchemy classes are not mentioned in the "Harry Potter" series; however, Rowling has used Alchemy as an example of a 'specialized' subject offered when there is sufficient demand. Alchemy is a philosophical tradition searching for the philosopher's stone, which is said to have the power to turn base metals into gold and to contain the elixir of life, which makes or keeps the drinker young and immortal. As mentioned in "Harry Potter and the Philosopher's