The Irish Times review described Dunsany's stories as "baffling", but called his style beautiful and his imagination strange but "captivating". It predicted that he would not be popular, but that he would have a cult following. It also praised Sime's illustrations.[1]
The Sword of Welleran and Other Stories marked the end of Dunsany's writing about Pegāna and the beginning of a new phase of his career, in which he wrote heroic fantasies in a more modern style. Darrell Schweitzer states that this period included much of his best work.[2] "The Fortress Unvanquishable, Save for Sacnoth" was one of the chief influences on sword and sorcery fiction.[3][4] Another important breakthrough was that Dunsany was writing short stories; heroic fantasy's forerunners were usually lengthy works.[2]