The Etched Tablet is given to starting troll hunters.
This item is the Quest Item for the quest  Etched Tablet which starts with Gornek in the Valley of Trials in Durotar.
It be good to hear that one of Jen'shan's <brothers/sisters> be comin' to da Valley to test <his/her> skill. Jen'shan lookin' forward to that!
Me not be havin' to tell you how strong and cunning a hunter you be--you already know that. It's Jen'shan's task to tell you how to get stronger and more cunning.
You find Jen'shan in da Valley of Trials. She teach you good. She teach you how to tame da greatest beasts among many other tings.
-Jen'shan, Hunter Trainer