Hey guys,
Been lurking here for a while, but finally decided to join in on the hunt. Began by loading Cisky's profile on wowhead, and checking his quests against mine. He does have one artifact quest completed that I do not. A quest that is a part of a MoP quest, but the specific part which I mean only got introduced in 7.0.1.
Lord Hal'shara's Tomb is the name. It's a part of a Rolo's Riddle from Timeless Isle in MoP.
After doing the first part on TI, I believe we have to find a tomb in Azsuna, sadly, there's no info anywhere about the location. I'm currently going through Azsuna, but will probably take a while on my own. If someone wants to investigate as well, would probably speed it up =)