In "The House of Hades," the character Akhlys warns Percy about the Death Mist, describing it as a malevolent force that envelops mortals in suffering as they transition to the Underworld. She emphasizes its connection to Tartarus, associating it with death and despair, indicating that it is far from a benevolent entity.

Percy, however, reacts to the grim description in a surprisingly light-hearted manner, humorously requesting two servings of the Death Mist as if it were a desirable item. This exchange showcases Percy's boldness and ability to find humor even in the face of dire circumstances.