Unlike his partner in crime, Chaplain Rourke, Shylock can be rooted and snared and is effected by pacy/harmony.
I have seen him spawn in 5-6 different locations so far, seen chaplain and Mage spawn in several also. So he can spawn in place of any drakkin in the camp.
Trying to solo this was a pain due to all the adds and hard splits. Shammys dont have a lot of options when pulling. Got some monk and Ranger help a few times and they even had trouble splitting these groups.
Large agro radius on all the mobs, raoming Sgts and Nameds see invis.
Only effective strat I found to split the groups w/o FD or pacy: pull an add in the named group and run like hell for the zoneline. Root the add just before you zone then pop into sunderrock to clear agro. Zone back in and kill the rooted add. Rinse and Repeat until the named is alone or only has one add, depending on what you can handle.