Helga Hufflepuff's Cup' is a magical item featured in the Harry Potter franchise. It is one of the seven Horcruxes created by Lord Voldemort that contained his one eighth of his soul in order to attain immortality. Owned by Helga Hufflepuff it passed down to her descendant, Hepzibah Smith, who was charmed by Tom Riddle. He later murdered her to turn the Cup into a Horcrux.
The Horcrux was destroyed by Hermione Granger in the Chamber of Secrets hidden below Hogwarts Castle.