With the exception of the 1980 epic historical novel, "The Lost Legion") his post-"Weird Tales" output was minor, most of it either self-published in small press editions or issued haphazardly by publishers who sought him. While he had already completed "The Ship from Atlantis", the second installment of the Merlin Saga, in 1941, it was only published 26 years later, when Donald A. Wollheim contracted to publish "King of the World's Edge" in book form and also accepted the sequel. "The Ship from Atlantis" follows the further adventures of Gwalchmai, who sets out for Rome but becomes lost in the Sargasso Sea and encounters a survivor from Atlantis. These two novels, later combined under the title "Merlin's Godson" (omnibus 1976), are a precursor to Munn's magnum opus, "Merlin's Ring" (1974).