Delirium's Mistress (1986) is a fantasy novel by British writer Tanith Lee, the fourth book in her series Tales From The Flat Earth.

[1] During the demon's age, when the planet was still flat, Azhriaz, daughter of Azhrarn, Demon Lord of the Night and a mortal, was hidden on an isle surrounded by mist and her spirit was protected to live forever in dreams.

Her powerful energy and beauty attracted Azhrarn’s enemy, Prince Chuz, who created a spell to free Azhriaz from her confinement and convert her into the Delirium’s Mistress.

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