Aunt Dahlia is the main antagonist in the short story "An Old Story" from Still More Tales to Give You Goosebumps.
History
She is a witch who goes around claiming to be related to various families as a "great aunt", and then ages their children into senior citizens with enchanted prune cookies to marry them off to her friends, including Lillian and Mimi, for a price. When Tom threw a pitcher of prune juice at her, her face melted away to reveal a skull, then her whole body collapsed into dust.
Other Apperances
She also appeared as an enemy in Goosebumps: The Game, She's defeated the same way as the book, with prune juice, once she's defeated, the player must take the cassette tape she leaves behind.
Trivia
- She, along with Mrs. Forster and the Gargoyle are the only Tales to Give You Goosebumps monsters to appear in a the game.