Motherless Child (Side Quest)
This side quest launches immediately after you complete the Blood in the Water Main Quest.
While technically optional, it's an awful lot of XP for something that's only a few feet away. Follow your marker to the room underneath the 'descendants' mural (the one at the base of the ladder).
Investigate the offering, the tablet, the scrolls,the note, and the engraving to reconstruct what happened here.
This completes the quest.