Guard Bayard:
Well, then visit the Varka Silenos to get the missing fragment, the Divine Stone of Wisdom. If you earn the Soul Guide Udan Mardui through Varka's Messenger Naran Ashanuk and prove to her your wisdom, you'll find it.
If you change your mind halfway, you can get it from the best Shaman of Ketra Orcs, Soul Guide Asefa through through Ketra's Messenger Wahkan, just bring it to me.