You will see the ghost of Hopespear, the goblin prophet. He will tell you a story about a battle between the goblin tribes; he will describe his vision from the Big High War God about how the goblins must stop fighting. Once you tell him that you have been to Yu'biusk, he will tell you that in order to free the souls of the goblin priests, you must complete a ritual of which includes killing the goblin priests to retrieve their bones and bury their bones in Yu'biusk. However, to retrieve their bones, you must defeat the goblin priests without use of weapons or armour.