Grand Magister Fairen:
First you must meet with Messenger Wahkan of the Ketra Orcs.They've been hiring mercenaries, and this is a great opportunity to gain their trust!
Soul Guide Asefa, the Chief Shaman of the Ketra Orcs has a Divine Stone of Wisdom that we simply must have!
If things don't go well with the Ketras, you should try the Varka Silenos tribe. They also have a stone. Good luck!