Well I finally got the head on my 4th attempt. I resorted to using a 54 ranger box, 57 monk box and my healer merc. On this last attempt, Murdrick seemed to stick around longer than he usually does, before despawning. He was CHealed 2 or 3 times but managed to take him down before the despawn timer. Id suggest some boxed help since the other mentioned tips arent the easiest to work out.
I for one was never able to Lull, Paci, Harmony, Snare, Root or single pull anything from the cave. I was never able to pull Murdrick to the Velks zone line as his pathing out of the cave is horrible. Im sure you can pull him out however while 3 boxing its more work than its worth. These days if youre not in some kind of guild, I doubt youd be doing this quest.
Edited, Nov 29th 2011 12:55pm by PinkkMaggit

Murdrick's Plan
Murdrick's head
Words of Collection (Caza)