Verbally describing how to get there, and my apologies for confusion I cause...
* enter the castle visible from the zone in and go all the way back across the 2nd moat to the wall behind it
* enter the left (north) room and go up the curving staircase in this room
* once up top go north a bit until you hit the edge of the castle ramparts
* then turn right (east) and go all the way down
* the path will become a hallway with a roof and then force you to turn right (south)
* you'll quickly hit a T intersection, turn left (east)
* then following the hall you'll very quickly be forced right (south) again
* stop there...
... Now, on your right is a hallway of doors. They are a sort of guard barracks -- one drolvarg per room. Past them are stairs that descend to the door of the Drolvarg Warrior room.
I stole this from a previous post but figured it would help... It helped me a ton!
Thank you Hardryv