Wanted: Dead or Alive

There is a being out there, by the name of Renaldo the Dark. I want him watched. I want him followed. And if you can bring him to me, dead or alive, then I shall bestow upon you rewards beyond your mortal comprehension.

And to this creature:

Promises I can't keep? Here's a promise.

I send a pestilence and plague
Into your house, into your bed
Into your streams, into your streets
Into your drink, into your bread
Upon your cattle, on your sheep
Upon your oxen in your field
Into your dreams, into your sleep
Until you break, until you yield
I send the swarm, I send the horde
Thus saith the Lord