This quest was marked obsolete by Blizzard and cannot be obtained or completed.
Eralan in Tranquillien wants you to retrieve the Archeologist's Shrunken Head from one of the chests in Zeb'Tela or Zeb'Nowa.
Remember how I told you about the fat merchant who was looking for that ring? As it turns out, he had his archeologist son looking for the thing and it didn't turn out so well. By not so well I mean they killed him and shrunk his head.
Now this might seem cold, calculating, and exceptionally callous, but he'd pay a lot to get his son's head back. Sounds like the perfect job for you!
Go east until you find the troll ruins of Zeb'Tela and Zeb'Nowa. You're bound to find it one of the chests there.