Orim of the Shadow:
You have found all 6 gems. Good job. While you were busy finding the jewels, I was working on the orders of inserting the jewels. And just now, I have solved the secret. Give me the jewels! Let's open the Cube of Aklantoth quickly!
Ask about the people who turned into 'undead'.
Give the Gems of Aklantoth to Orim.