BEWARE! PEASANTS HAVE GONE ON STRIKE, GOTTEN WAY BETTER PAY, AND NOW HAVE MUCH POWER!
The Black Plagueue was a virus carried by the black rats. Fleas would bite the rat, carry the virus to the human body, and puke it into the human bloodstream.
The serfs went on strike because they needed more money after the damaging disease. In this way their pay shot way up.
The upper class people started loosing power and the lower class people started gaining power. There was so less people and so much money that the money was worth very little. In this way the peasants gained much power.