Tersurus was a planet that had singing stones and clone banks. (NA: All-Consuming Fire) Following a ploy with the Daleks on 22nd century Earth, the Master travelled with Susan Foreman in his TARDIS to Tersurus, where she believed she killed him. During the encounter, his TARDIS sent a signal to Gallifrey that brought Chancellor Goth to Tersurus, where he found the Master. (EDA: Legacy of the Daleks, DW: The Deadly Assassin)