This wave was also called the Last Wave because Ebnez adapted a death stone into a shield stone to keep Mundanes out of Xanth.
This wave was Trent's army which he was going to use to attack Xanth. Since he became king without violence, his army settled peacefully.
The was is also called the Next Wave. They were aided by the Horseman, a Xanthian werehorse. He took out any king who lead well.
This was is also called the Black Wave. They settled peacefully.
There will not be any more Waves into Xanth. In Air Apparent the physical connection between Xanth and Mundania has been severed. Mundanes still make it to Xanth through other means but not in large numbers.