Plague

a terrible disease that strikes the kingdoms at least once every generation, destroying entire cities and dwindling the population. There is no documented record of the origins of the Plague and over the millennia the kingdoms have drawn closer and closer together for the preservation of their races. Documents discovered in abandoned towns and fortresses reveal that there are complete civilizations that have been wiped out by the Plague and races that used to exist but no longer do. The island kingdom of Kenatos was founded to be a last bastion for civilization and to preserve all knowledge and a remnant of each surviving race.