Putting some info up since I just completed this step. The instanced zone was a pretty fun fight. Took me a few tries, but here's my strategy. Sir Wembly's Tomb is in the Vermin's Snye.
Once you zone in stay in the NE corner, that's where I pulled to. There will be a wondering A Bloodsaber Construct roaming. Let him path into the other room before you pull. In the first room there are 6 constructs (skeles) along the wall, in pairs. Pull the closest one to the NE corner, kill both, med up, rinse and repeat until those 6 are dead. Remember to let the roamer path between pulls. Now pull that roamer and kill him.
Now head south. There now will be a chain of 3 skeles. I pulled them into the SW corner and killed.
Last but not least is the named fight, Xaurb Grengar. He conned white to me at 19. There was a repop, so med up as fast as you can. I just ran East and rushed him. He was easier than the skeletons LOL.
Hope this helps anyone aspiring to be a Templar. :)
Edited, Sat Jan 1 23:53:28 2005 by vipervick