The Fearless 

"A host. That is what every plague desires. A home where it can thrive, a strong specimen with enough resistance to stay alive long enough for the pox to grow, to mature. To spread. You see, my friend, the greatest plague of all is the one that can spread without killing, at least not until it has used its host for all that it has to offer, to spawn new disease swarms to continue on, and on and on. For that it needs a sturdy victim, such a rare thing to find. But when one does appear, there is no more wonderful pairing to be had. A perfect symbiosis -- the most virulent of poxes spread by the most durable of hosts. "