Korumonerk is lonely, and wants to see his diary and letters from his family from when he first started his travels. He said the Krall stole the cube that contains them and asked you retrieve it for him. So you went to the Kaidan Headquarters to kill Chieftain Kurka, and when you returned to Korumonerk with the cube and some more Krall Molars, he gave you a jacket that he had made.