I should search around the tower at the north end of Oggok to see if it houses any sort of Rallosian artifacts that may be linking the ogres to their god.
Find and destroy the Rallosian Idol ( -382, 70, 57 ) Copy/waypoint -382, 70, 57
Note: If you're Skyshrine geared, just fly to the top of the tower and let them add when you attack the battlepriest, then click the idol next to him after the fight. Otherwise, clear the tower first or you'll get adds on you.