Master Digler:
Go to the Ketra Orcs or the Varka Silenos and bring back the Divine Stone of Wisdom. If you gain the trust of Soul Guide Asefa and prove yourself to the Ketra's Messenger, Wahkan, you should be able to obtain the Stone.
Alternately, you can obtain the stone from Soul Guide Udan Mardui through the Varka's Messenger, Naran Ashanuk. It matters not which path you choose, as long as you return with the Divine Stone of Wisdom.