Battle in Underground Land

In this seventh book of Sukhinov's Emerald City saga, the struggle between the forces of Good and Evil finally breaks out into open warfare as, at the urging of Marshal Magdar of the Marrans, the residents of Magic Land assemble an army, build a fleet of warships, and sail over the Subterranean Sea in order to carry out a preemptive strike on the Isle of Gorn, headquarters of the evil Pakir.