And as for mages there is a nice guide here.
did this on my druid, he vanished after about 200k health gone.
no chance of a clothy doing this as i had 15 stacks of sunder when he did and it started to hurt :P
It does start to hurt, but you can get out of the sunders pretty easily.
The sunder lasts 20 seconds, and is cast every 10 seconds. If you, at 12 seconds left on the sunder, jump over the right side of the pyramid (bloodlord's right, facing down the staircase), and land on the ground, you can run clockwise (again, from the bloodlord's POV), around the back, to the front staircase and back up without getting hit again by the raptor.
You only get summoned to the boss if you land on ground that he can't reach, such as the middle-level of the pyramid, or a block without a path up it.
I'm at work, can't really take a video, but if you are fighting boss from the top of the pyramid, this is an easy way to get rid of sunders. You will have to clear the raptors on either side first.
Another method found how to remove Raptor from fight, gona upload video later.
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