The Costello Mask was a family heirloom that belonged to the House of Costello. The Costello Mask was made by Bartholomew Costello in 1696. This mask was a legendary icon that symbolized the power of the House of Costello. In 2014 the mask also became a Horcrux for Thomas Costello's soul. Thomas turned this mask into a Horcrux after he knew he was marked for death. This Horcrux was destroyed at the Third Battle of Hogwarts in 2021 by Jack Vincent when he tried to kill Thomas Costello with an Incendio spell that backfired and killed Jack and burnt the Hogwarts suspension bridge.