An elephant-sized spider who lives in the Forbidden Forest. Fifty years prior to Harry’s time at Hogwarts, Hagrid took raised Aragog, and Tom Riddle framed Hagrid for opening the Chamber of Secrets by making the teachers believe that Aragog was the monster that attacked several students and killed Myrtle. When Hagrid is taken off to Azkaban for the same crime in the present, he gives Harry and Ron a clue to find Aragog. Aragog then tells them that he is not the monster from the Chamber, and provides the crucial hint that the student who died fifty years earlier died in a bathroom.