Ghouls are humanoid creatures with rubbery skin, hoofed feet, and canine facial features. They dwell in vast tunnel networks beneath graveyards and catacombs, subsisting on corpses and grave-matter.
Lovecraft implies that humans may degenerate into ghouls over time, a fate most vividly suggested by the painter Richard Pickman. In the Dreamlands, ghouls maintain their own society.