Down Styphon! is the eighth and concluding book in the Kalvan Saga begun by the late H. Beam Piper in 1964. Great Queen Rylla decides that the time has come to return home to Hos-Hostigos. Not everyone is happy with this turn of events, but Rylla is a force of nature and asserts her will. Now it's up to Great King Kalvan to see that it happens.