As a lvl 50 paladin I was given several tasks from the taskmasters in Rathe Mnts. to go to Lower Guk and eliminate 10 of these. The best spot I had found to camp was up above from the corrupted gnome and all the way to just outside the ghoul lord's room. Set up in the hallway leading to the Arch Magus and you are safe to med/heal with no roamers. Just be careful not to fall down into the area with the corrupted gnome, he can be a pain in the behind to solo.
I think most classes could probably solo the tasks involving these guys. A 10 shot of an invis vs. undead potion would make it possible to get down there (for the classes lacking spell/hide/etc) and then just being careful on pulls. Single pulling is possible from the hallway leading to the Magus. Fight in there and you are safe from adds.
Doing the tasks was great experience not to mention the 2 blue bubbles of xp, and 50ish pp rewards (for medium setting).