Vindiami the Ancient is at the end of this instance ( -70, 0, -110 ) Copy/waypoint -70, 0, -110 and will be an NPC and not attackable until you have killed the four limestone watchers. These limestone watchers can be found inside alcoves around the zone, at
( -219, 0, -94 ) Copy/waypoint -219, 0, -94,
( -200, 0, -61 ) Copy/waypoint -200, 0, -61,
( -161, 0, -93 ) Copy/waypoint -161, 0, -93,
( -146, 0, -145 ) Copy/waypoint -146, 0, -145. Note: Recommended to keep this one alive until you have cleared the room where Vindiami is.
Each of these watchers will also be NPCs and not attackable until you have killed 4 brittle bones, each spawned by examining the 4 skeletons within the alcove, 2 on each side of the watcher, in the horizontal wall spaces that hold the canoptic jars. Once all the brittle bones are killed, the limestone watcher will turn into an attackable and aggro limestone watcher, level 28^^^ heroic. Repeat this for all four watchers, and Vindiami the Ancient will turn attackable and aggro, level 33 Heroic^^^.
A discussion page exists which may contain more information