The plotline of the story is based on the myths of Thor's expedition to Jotunhem as told in the Gylfaginning section of Snorri Sturluson's Prose Edda, and the Völva's prophecy regarding Ragnarok in the poem Völuspá, preserved in the Poetic Edda.
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Dissatisfied with his life, he attempts to use his boss's process to project himself into the world of Irish heroic mythology, where with his modern knowledge he thinks to set himself up as a wonder worker.
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The "worlds" so examined include not only the Norse world of "The Roaring Trumpet," but those of Edmund Spenser's The Faerie Queene in "The Mathematics of Magic," Ludovico Ariosto's Orlando Furioso (with a brief stop in Samuel Taylor Coleridge's Kubla Khan) in "The Castle of Iron," the Kalevala in "The Wall of Serpents," and finally (at last), Irish mythology in "The Green Magician."
The five stories collected in The Complete Compleat Enchanter explore the worlds of Norse mythology in "The Roaring Trumpet," Edmund Spenser's The Faerie Queene in "The Mathematics of Magic," Ludovico Ariosto's Orlando Furioso (with a brief stop in Samuel Taylor Coleridge's Kubla Khan) in "The Castle of Iron," the Kalevala in "The Wall of Serpents," and Irish mythology in "The Green Magician."