Fafhrd and the Gray Mouser/Definition

"Write the definition here (maximum one sentence of 100 characters, ignoring formatting characters). Don't include the term defined in the definition itself, and start the text with a capital letter. Further details of how a definition should look like are given at CZ:Definitions. (Delete this note, including the enclosing quotation marks, after reading.)" A pair of literary characters created by Fritz Leiber.