For a discussion on quest availability please visit the talk page.
On PvE servers, this is a guide or GM-related event. PvP and Exchange servers may have this quest as a constant fixture. The quest introductory information reads as follows:
The gnolls have killed many innocent travelers in Norrath; the depths of Blackburrow are filled with their smouldering skeletons. My allies and I will help set the spirits of the dead to rest, and make Norrath safer for travelers in the future.
A discussion page exists which may contain more information