Let's call him Uno
Basically, this would be an monthly, invite only, Epic as determined by the Imms.
Essentially, he would be based in one room off Godsland. A group is formed, and you get once chance to kill him, no flee, no recall, no return.
A group of 15 minimum would be required, and the reward would be 15dr. For a 20 man group, the reward would be 20dr. The mob has to be set fairly, but will obviously be able to lash out at anyone in the group occasionally.
Just an idea to encourage big groups