Urth of the New Sun
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Urth of the New Sun is a science fiction novel by Gene Wolfe that serves as a sort of coda to his 4-volume Book of the New Sun series. Like Book, it is of the dying earth subgenre.
Urth picks up the tale of Severian, the protagonist of Book of the New Sun, years after that work's end. He leaves his role as Autarch of Urth to seek a new sun for Urth.