The Glyphic Tablet is given to starting troll mages.
This item is the Quest Item for the quest  Glyphic Tablet which starts with Gornek in the Valley of Trials in Durotar.
Welcome to your awakening, mon. Da secrets of da arcane be wit'in your grasp if you be strong enough to hold onto dem.
You find Mai'ah when you be ready. She teach you much about magic and da spells you need to destroy those dat stand against you.
Mai'ah be near da Den in da Valley of Trials. You come, you find here, den you be strong. Den you show other mages how magic bends to your will... not de other way 'round.