Children of Terrat — William Emmett

In book 1, the lands around the middle sea between the two main continents of Terrat were controlled by Ronnin. The accidental arrival of Menem from Earth and his union with Destiny, allied with Parit, survived the ultimate battle and finally defeated Ronnin in the process. Book 2 is about the children of Destiny and Menem, who grow into positions of power and now have to confront the reestablished Ronnin Empire. What technology can they invent to defeat a much larger nation who has Parits weapons from the last battle? How will it all end?