Some of Munn’s late horror stories were published in such anthology series as Daw Books’ "The Year's Best Horror Stories". After his retirement he produced a number of stories for small-press magazine, especially "Weirdbook". He developed a new sequence that sought to link Lovecraft's Cthulhu Mythos stories with an Arthur Machen-esque ancient race of Pictish fairies. The published tales are "The Merlin Stone" (1977), "The Stairway to the Sea", and "The Wandered of the Waters", all in "Weirdbook." Every birthday and Christmas from 1974 to 1980, Munn issued a booklet as gift for friends. These were usually poetry, but several were short fantasies.