Thuul

Thuul was a level 45 portal trainer located in the Valley of Spirits in the orcish city of Orgrimmar.

Quotes
As a mage, you are one of a select group that can conjure a portal to transport you back to this very place. I can teach you if you are ready.
 * To mage

I do not believe you possess the mental acuity to grasp the nature of portal magic.
 * To non-mage