Necrowhatnow?

Wicked's guild is Necromonger. What's a Necromonger? She's glad you asked! The word comes from the movie Chronicles of Riddick, which was an enjoyable action movie. Necromongers are this militaristic nation of people who worship death, seek out an alternate reality called the Underverse, and destroy everything along the way.

From the Wikipedia entry:

The film opens with a narrative, explaining the presence of the Necromongers, a race of pilgrims travelling across the universe in search of the Underverse. Their leader, the "holy half-dead Lord Marshal" (Colm Feore), systematically commands his Necromonger Legion Vast to overrun worlds and convert its inhabitants into Necromongers; those that oppose conversion die.

From the IMDB site:

They are an army unlike any other... crusading across the stars toward a place called UnderVerse, their promised land - a constellation of dark new worlds. Necromongers, they're called. And if they cannot convert you, they will kill you. Leading them, the Lord Marshal. He alone has made a pilgrimage to the gates of the UnderVerse... and returned a different being. Stronger. Stranger. Half alive and half... something else. If we are to survive, a new balance must be found. In normal times, evil would be fought by good. But in times like these, well, it should be fought by another kind of evil.

So basically combine Death Knights with Draenei and poof - Necromongers. Only mine's a gnome!