Dumbledore and Harry learn that Voldemort created six Horcruxes to gain immortality, and that they must be destroyed before Voldemort can be killed. Harry repeatedly warns Dumbledore that Draco Malfoy is an agent of Voldemort, but Dumbledore refuses to take action against Draco. He tells Harry that he already knows more about what is happening than Harry does. Near the end of the novel, Dumbledore and Harry enter a cave in search of a Horcrux. Dumbledore drinks a potion inside the Horcrux's container and begins to scream in agony. When Harry attempts to retrieve some lake water for Dumbledore to drink, he is attacked by Inferi that reside in the lake. They try to drown Harry, but Dumbledore rescues him.
Dumbledore and Harry learn that Voldemort created six Horcruxes to gain immortality, and that they must be destroyed before Voldemort can be killed. Harry repeatedly warns Dumbledore that Draco Malfoy is an agent of Voldemort, but Dumbledore refuses to take action against Draco. He tells Harry that he already knows more about what is happening than Harry does. Near the end of the novel, Dumbledore and Harry enter a cave in search of a Horcrux. Dumbledore drinks a potion inside the Horcrux's container and begins to scream in agony. When Harry attempts to retrieve some lake water for Dumbledore to drink, he is attacked by Inferi that reside in the lake. They try to drown Harry, but Dumbledore rescues him.