Plague Reoccurrence Routine
This will run every year, but will not actually kick in until after a fief has been hit the first time and a fiefs immunity from the last hit wears off. That's why we have a field for the last occurrence of the Plague. We will also diminish impact for subsequent infections.
Death rate constant when plague hits. The Game's Sysop unleashes the Plague, when it will cause the most damage, entertainment, excitement, whatever.
It is important to note that at this time the Plague does not reoccur in the game.