The Birthplace of Moriens lies deep within the Upper Catacombs, near the entrance to the Shrine of the Ancient Ones. It was here, where the first Necromancer, Moriens, was born. This place has become a sacred place, and every new Necromancer comes here on a pilgrimage to see a fantastic vision (everyone sees something different). It is considered the final piece of the voyage.
The Avatar also was sent there on pilgrimage, but chose to ignore the Birthplace. The Avatar instead found the entrance to the Shrine, a far more important location in the quest to leave Pagan.