After giving Dobby a proper burial at Shell Cottage, Harry speaks with Griphook the Goblin about breaking into Bellatrix Lestrange's vault at Gringotts, as he believes that a Horcrux is hidden there. Griphook agrees to take Harry, Ron, and Hermione to Bellatrix's vault if they give him the Sword of Gryffindor in return. Harry then asks Ollivander, the wandmaker, to identify the wands they took from Malfoy Manor. Ollivander says they belong to Bellatrix and Draco Malfoy, but Malfoy's wand has changed its allegiance to Harry. Harry then reveals that he knows Lord Voldemort has stolen the Elder Wand, the most powerful wand to ever exist, from Albus Dumbledore's tomb.