The watchers are not attackable until you disturb each of the four skeletons in in the walls around the alcove. Distubing a skeleton will spawn a level 26 brittle bones, which you must kill.
As soon as the fourth skeleton dies, the limestone watcher will become attackable.
Collect the three missing statues of the ancients:
In an alcove down the first tunnel on the left, at ( -172, 1, -31 ) Copy/waypoint -172, 1, -31
