Seer Skahi:
Dear Warrior who is looking for the power of the ancient Orcs...!
The power of this stone was created by the gods but stolen by devils! Find the Archon of Halisha inside the Four Sepulchers at the Human Imperial Tomb!
If entering is too difficult, go to the Shrine of the Loyal and fight Halisha's minions! He'll show up if you kill enough of them.
Defeat him and get the Stone of Commune!