Biting, ominous, seductively beautiful - Echidna, a hybrid creature from Greek mythology, a lovely woman and a horrible snake, stood for both fearsomeness and fertility. Her numerous descendants include monsters such as the Hydra and a certain Kerberos. Captivated by its fascination, the French knife designer Raphael Durand has dedicated himself to this myth in detail with the Boker Plus Kerberos and has discovered further interesting details in his search for clues.