mulehead

I'm in the Black Mountains just outside of Camelot City. I've been given a
task to kill Slith. I have to anger him to spawn him. I'm over in the woods
at the foot of the hill near the small camp with the merchants. I assume to
spawn Slith you have 5to kill Slith Broodlings. I've been killing the by the
dozen (their names are grayed out), but no Slith yet, just the broodlings.
Am I on the right track? How many broodlings do I have to kill to bring out
Slith?