Regulus Black's locket

The locket of Regulus Black, A.K.A R.A.B. was used to replace the locket of Salazar Slytherin Horcrux, in the attempt to destroy it. It was, later, used by Harry Potter to turn the house-elf Kreacher to his side. Kreacher was, later, seen fighting with it in the Battle of Hogwarts.

Appearances

 * Harry Potter and the Half-Blood Prince
 * Harry Potter and the Half-Blood Prince (film)
 * Harry Potter and the Deathly Hallows