Head Summoner Radyss:
At first, go to the Messenger Naran Ashanuk of Varka Silenos. I heard that they are hiring the foreign mercenaries. If so, it is a good opportunity to gain their trust!
The Divine Stone of Wisdom that we are looking for is possessed by the Soul Guide Udan Mardui, the head shaman of the Varka Silenos.
Hack... If things are not going well, change the plan and approach the Ketra Orcs tribe. I will pray to Eva for help.